On December 1, protesters occupied Kiev's city hall and Independence Square and began camping on the square.

December 3-6, Yanukovych visits China and Russia for economic support.

On Dec. 8, about 800,000 people took part in protest demonstrations.

On Dec. 14, pro-government crowds also protested in Kiev's Independence Square.

On Dec. 17, Russia offered Ukraine a $15 billion loan and cut the price of exported Ukrainian gas by a third. The protests have not stopped since then. In January 2014, Yanukovych made concessions to the opposition, accepting the resignation of the entire cabinet and the resignation of Prime Minister Azarov from power. But the opposition remained adamant in its assertion that Ukraine must strengthen its ties with the EU, not Russia, and repeatedly urged President Yanukovych to resign as well.

On Jan. 16, the Ukrainian parliament passed a bill placing restrictions on protests.

On Jan. 22, two protesters were killed in clashes with police.

On Jan. 24, protesters began storming regional government offices in western Ukraine.

On Jan. 28, Ukrainian Prime Minister Mykola Azarov resigned and the parliament lifted a law restricting protests.

On Jan. 29, Ukraine's parliament passed an amnesty decree promising not to prosecute any protesters arrested during the protests as long as they left government buildings. Protesters expressed skepticism about the terms of the amnesty. Anti-Government Protesters On February 18, anti-government demonstrations in Ukraine escalated dramatically. Thousands of demonstrators went to protest near the parliament building with the intention of forcing the parliament to pass a resolution to restore the 2004 constitution. Heavy clashes between the demonstrators and the police ensued. The clashes have resulted in 26 deaths. On the same day, the Ministry of Internal Affairs of Ukraine revealed that nearly 800 people had been injured in the clashes, including 392 law enforcement officers, 83 of whom "suffered serious gunshot wounds". Riots in Ukraine have spread from the capital Kiev to other cities.

On Feb. 21, Ukrainian President Viktor Yanukovych and three opposition leaders signed a reconciliation agreement aimed at ending days of bloody street clashes.

On Feb. 19, a "truce" was agreed between the government and protesters.

On Feb. 22, the Ukrainian parliament voted to remove the incumbent president from office and set May 25 as the date for early presidential elections, after Yanukovych left the capital, Kiev, and traveled to Russia, but refused to resign, saying he had left the country because of "threats to his personal safety and that of his loved ones. ".

On Feb. 22, protesters continued to demand that Yanukovych step down. The European Union convenes a special meeting of foreign ministers on the Ukraine crisis. Yanukovych fled the presidential palace and traveled to the northeastern city of Kharkiv. He then made a televised speech in which he described the events in Kiev as a "coup d'état" and insisted that he was a legitimately elected president. Parliament has since voted to impeach Yanukovych for "failing to fulfill his constitutional duties". Former Prime Minister Petro Tymoshenko, who had been in prison for three years, was released from jail. Oleksander Turchinov, Tymoshenko's deputy, was elected speaker.

Regime change in Ukraine. Ukraine's parliament deposed President Viktor Yanukovych, changed the constitution and set a May 25 presidential election.

On Feb. 23, parliament approved Turchynov as interim acting president.

On February 24, Yanukovych was wanted by Ukrainian police.

On Feb. 27, dozens of pro-Russian militants occupied Crimea's Autonomous Assembly and government buildings, while Russia's foreign ministry said it would "resolutely defend the rights of our compatriots in Crimea." Acting Ukrainian President Turchynov sternly warned the Russian Black Sea Fleet in Crimea to stay at their bases, and that "any military movement will be considered an invasion". On March 1, the Russian parliament approved President Vladimir Putin's request for the use of Russian troops in Ukraine's Crimea region, adding to tensions between the two neighbors.

Violence in Ukraine's Maidan On March 3, a Ukrainian airbase in Crimea declared its allegiance to the pro-Russian Crimean government, formally breaking away from Ukrainian leadership. The 240th Tactical Aviation Brigade base of the Ukrainian Air Force, located near the Crimean capital of Sevastopol, declared its allegiance to the Crimean authorities on March 3rd. The base has more than 800 troops as well as about 50 aircraft.

On March 4, some of the Ukrainian army in Crimea turned on its side after the Federation Council, the upper house of Russia's parliament, passed a resolution in support of Vladimir Putin's use of force against Ukraine.

On March 4, Russia's Gazprom announced that Ukraine still owed more than $1.5 billion in gas bills, and that as of April 2014 it would stop supplying Ukraine with preferential gas. In response, the U.S. announced $1 billion in aid to help Ukraine respond to "politically motivated trade actions by Russia." The U.S. is prepared to provide assistance and funding to help Ukraine reduce its dependence on Russian gas, and the U.S. is also prepared to provide technical advice to the Ukrainian government on clarifying Ukraine's WTO rights with respect to trade with Russia.

March 4, the Russian Federation Council (Upper House of Parliament) Deputy Speaker Bushmin said the Crimean government requested Russia to provide $ 6 billion in economic assistance, the Russian Ministry of Finance has developed a relevant program, will be immediately submitted to the government for consideration.

On March 6, in the midst of this mess, Sergei Valerievich Aksyonov, the leader of Crimea's Russian Unity Party, stood out with his consistent pro-Russian stance, and was elected prime minister of Crimea's Autonomous **** and State with Russia's backing.

On March 6, the situation in the Crimea region of Ukraine was tense, and the U.S. Navy destroyer USS Truxton had sailed into the Black Sea to prepare for exercises with allies; at the same time, the U.S. military also sent warplanes to Lithuania and Poland.

On March 8, a Ukrainian military plane came under fire at the Crimean border, and on the same day nearly 100 Russian military vehicles entered the area.

Russia adds more troops, 200 military vehicles drive into Crimea On March 9, Ukraine's Crimean Autonomous **** and State Deputy Prime Minister Temirgaliev said the interim government in Kiev had blocked the electronic systems of Crimea's Autonomous **** and State Finance Ministry and frozen its assets.

The intricate Crimean situation took a new turn on March 11, 2014, when the Crimean parliament adopted a declaration of independence for Crimea by 78 votes out of 81 in favor.

On March 11, 2014, the Verkhovna Rada (parliament) of Ukraine voted to adopt an appeal to the United States and the United Kingdom, among others, to guarantee the territorial integrity of Ukraine.

On March 17, a tally of all the votes cast in the referendum showed that 96.6% of voters were in favor of Crimea's accession to Russia, with only 2.51% opposed . Russia agreed that Crimea should join the Russian Federation.

The Ukrainian Foreign Ministry announced on the 17th that in view of the situation related to Crimea's autonomy*** and state, Ukraine will recall its ambassador to the Russian Federation, Vladimir Ilychenko.

On March 20, Ukraine's health ministry said the death toll from the riots that led to regime change in the country last month, rose to 103 people.

On March 24, Ukraine's interim President Turchynov said he had ordered the country's armed forces to withdraw from Crimea.

On March 27, former Ukrainian Prime Minister Petro Tymoshenko, who was recently released from prison, said he had decided to run for the Ukrainian presidency in May. At the heart of the Ukrainian conflict On April 2, Pashinsky, the acting head of the Ukrainian presidential office, said Ukraine had drawn up a breakdown of property it was demanding back from Russia, including 70 ships. The ships are mainly deployed in Crimea, which has joined Russia.

On April 3, Ukraine's acting Interior Minister Arsen Avakov accused deposed former President Viktor Yanukovych of issuing a "criminal order" to shoot at protesters during the February riots in Kiev. Avakov said Yanukovych issued a "criminal order" on Feb. 18-20 to fire on demonstrators. The Russian Federal Security Service (FSB) denied the claim.

April 7, Ukraine's southeastern Donetsk region erupted in popular rallies, some members of parliament set up a "Donetsk People's Council" and announced the formation of "Donetsk independent **** and state", demanded the introduction of peacekeeping forces from Russia and proposed to be held before May 11 to join the Russian Federation. The government has also called for the introduction of peacekeeping forces from Russia and is planning to hold a referendum on joining the Russian Federation by May 11th.

April 13, Crimea's independence in Ukraine caused a chain reaction has made the authorities in Kiev uneasy, pro-Russian armed forces in the eastern Ukrainian city of Slaviansk again, prompting the Ukrainian government began to mobilize the national security forces to launch "anti-terrorist operations.

On April 15, Ukrainian government forces deployed tanks, armored personnel carriers and helicopters to launch a military operation in the eastern Donetsk region to eliminate pro-Russian militants.

On April 25, a Ukrainian Mi-8 helicopter at the Kramatorsk civilian airport in Donetsk Oblast exploded after it came under grenade fire from local militia and detonated an adjacent An-2 aircraft.

On April 27, Deakin, director of the Crisis Management Center at NATO's military headquarters, made an announcement that 40,000 Russian soldiers were massed along the Ukrainian border, with tanks, helicopters, artillery, special forces, combat aircraft and logistical units deployed in more than 100 locations. They have been on standby there for weeks, with some units just 40 kilometers from the Ukrainian border.

On April 28, President Obama sought to put more pressure on Russian President Vladimir Putin by announcing that the U.S. had imposed sanctions on seven Russian officials and 17 companies because of Russia's continued "meddling" in Ukraine, the White House said.

On April 30, Ukrainian Speaker of Parliament Turchynov, who is acting as Ukraine's president, announced that the country's armed forces had entered a state of full combat readiness. He acknowledged that the authorities in Kiev were no longer in control of the situation in both the eastern Donetsk and Luhansk regions. In a meeting with the Chairman of the Committee of Ministers of the Council of Europe, Austrian Foreign Minister Kurz and the Secretary General of the Council of Europe, Prime Minister Arseniy Yatsenyuk of the Interim Government of Ukraine said that the current situation in Ukraine is very complex and that the Ukrainian side has adopted all political means to mediate the current crisis. On May 2, full-scale fighting has started in Slavyansk by Ukrainian government forces. Russian troops on the Ukrainian border have also begun operations. 2 Ukrainian helicopters were shot down by missiles, one pilot was captured and one died. The military operation in Slavyansk is progressing rapidly: a roadblock has been seized, the TV and radio stations have been taken control of, smoke is rising from the city, and the pro-Russian forces are facing total annihilation, with no possibility of escape. By now, the pro-Russian forces in Slavyansk were holding seven OSCE observers, including a German colonel, and more than 30 Ukrainian politicians and journalists, who became human shields. On the same day, clashes between pro- and anti-government factions in the southern Ukrainian city of Odessa on the Black Sea coast led to 43 deaths and 214 injuries, 25 of them very serious.

Armed clashes erupted again on May 5 in Slavyansk, a city in the Russian-speaking part of eastern Ukraine, which has left four government soldiers dead and about 30 others wounded. Civilians in the city have also been killed and injured.

Forty-eight people are missing after the May 6 clashes in Odessa that left dozens of pro-Russian protesters dead. Vadim Savchenko, a member of Ukraine's Odessa Oblast Soviet, put the number of people who died in the Odessa incident at 116.

On May 11, a referendum was held in the eastern Ukrainian regions of Donetsk and Luhansk to decide whether to become independent. Voting began at 0800 hours local time and will continue until 2200 hours that day. The referendum will ask only one question: whether to support the establishment of a "Donetsk People's **** and State". The Luhansk region has the same question: whether to support the establishment of the "Luhansk People's **** and State".

On May 12, the results of the referendums in eastern Ukraine's Donetsk and Luhansk oblasts came in, with 89 percent and 96 percent of the vote in favor of independence, respectively. Subsequently, the two oblasts were declared independent "sovereign states".

On May 13, a convoy of armored vehicles of the Ukrainian army was ambushed near the city of Kramatorsk in the eastern Donetsk region, killing seven Ukrainian troops and wounding seven others in the fighting. This is since Ukraine in mid-April in the eastern region to carry out "anti-terrorist operation", the Ukrainian military in a battle of the largest number of dead and wounded.

Ukraine is scheduled to hold presidential elections on May 25th. It is considered the most important election in Ukraine's 23 years of independence and could be a key step in defusing the Ukrainian crisis. The candidate with the best chance of winning the election is Petro Poroshenko, who is known as the "Chocolate King". Speaker of the Ukrainian Parliament Alexander Turchynov, who is acting as President of Ukraine, called on voters to go to the polls before the 25th to avoid the division of Ukraine. There are 21 candidates in the current presidential election*** and about 35 million people are eligible to vote. A number of opinion polls show confectionery tycoon Petro Poroshenko leading by a wide margin. A new survey showed Poroshenko's approval rating at nearly 45 percent, compared with about 7.5 percent for his strongest rival, former Prime Minister Yulia Tymoshenko.

On May 27, the Ukrainian government announced that it had resumed "special operations" in the east, taking full control of Donetsk's international airport, which had been taken over by pro-Russian militia the day before.

According to CNN, the mayor of Donetsk in eastern Ukraine, Alexander Lukyanchenko, said on May 27 that heavy fighting at the Donetsk airport resulted in 40 deaths and 31 injuries, with two civilians among the dead and four among the wounded. On the 14th, opposition forces shot down a Ukrainian transport plane, killing 49 people on board.

On the 27th, Petro Poroshenko signed the EU Associated States Agreement, marking the official launch of Ukraine's preparations to join the EU. From 5 to 6, the opposition lost Slaviansk and government forces took back the area.

On the 17th, Malaysia Airlines Flight MH17 was shot down by a missile in an opposition-controlled area in the east, killing all 297 people on board, with the government and opposition blaming each other for the downing of the plane. (7-17 Malaysia Airlines plane crash).

On the 29th the European Union and the United States accused Russia of destabilizing eastern Ukraine and announced economic sanctions against Russia. On the 7th Russia decides to impose counter-sanctions on the US and EU by banning most food imports from the EU and the US.

On the 22nd, the Ukrainian government accused Russia of "direct aggression" after a disputed Russian convoy crossed the border into Luhansk.

On the 25th, the opposition launched a counteroffensive in southern Ukraine.

On the 26th, Poroshenko and Putin held talks at an EU summit in Minsk, but achieved no results.

On the 28th, the Ukrainian government said the opposition had captured the border town of Novoazovsk, accusing Russia of a direct invasion. NATO says Russia has more than 1,000 troops in Ukraine and says large quantities of heavy weapons have entered the country, which Russia denies.

On 29, Ukrainian Prime Minister Arseniy Yatsenyuk said Ukraine would launch a plan to join NATO.

31, Putin for the first time to "statehood" to describe the eastern region of Ukraine, but then the Russian side denied, said it was misinterpreted. On January 1, Ukrainian government forces withdrew from Luhansk airport and then from a number of other opposition-controlled areas. The government side accused Russia of "waging a huge war" that has killed tens of thousands of people.

On March 3, France announced it was suspending deliveries of its Northwesterly-class helicopter carrier to Russia, and on the same day Putin unveiled a "seven-point peace plan" after a telephone conversation with Poroshenko.

4, the opening of the NATO summit, the crisis in Ukraine has become the main topic, Poroshenko said he would order the army to implement a conditional ceasefire the next day, the opposition has received a positive response.

On the 5th, both sides of the Ukrainian conflict signed a 12-point ceasefire agreement in Minsk, which came into effect at 23:00 GMT that night. The southeastern port of Mariupol, the eastern city of Donetsk one after another to restore tranquility. On the same day of the NATO summit, Rasmussen announced that he would set up the Always Rapid Reaction Vanguard Force, aimed at targeting Russia. The same day, the European Union announced sanctions against Russia, and will be officially implemented on the 8th.

On the 6th, much of eastern Ukraine remained calm, with sporadic friction. Government forces and the opposition accused each other of violating the ceasefire agreement. Russia's Foreign Ministry warned that it would respond to EU sanctions if they were implemented. On the same day, Putin spoke by phone with Poroshenko, saying that the ceasefire was better implemented and that he hoped for a long-term ceasefire in the region.

The leaders of Russia, Ukraine, France and Germany met in the Belarusian capital of Minsk on Nov. 11 for the Normandy Quartet talks.

Russian President Vladimir Putin announced in Minsk on February 12 that all parties to the Ukrainian crisis had agreed to a cease-fire from February 15th.

On February 21, Ukrainian civilian forces and government troops exchanged prisoners of war.

Some analysts believe that the real "peace into the reality of Ukraine" still need to pass numerous hurdles. For example, Poroshenko's ability to balance the warring factions with the peacemakers in the country? Obama's ability to coordinate between hardliners and conciliators in his country? Putin's ability to influence the forces in eastern Ukraine? What is the EU's ability to broker peace? This series of questions can not find precise answers at once. U.S. Secretary of State John Kerry said it was a "critical time" for Russia and pro-Russian separatists to fulfill a peace deal aimed at ending violence in eastern Ukraine.

Kerry met with Russian President Vladimir Putin and Foreign Minister Sergey Lavrov in the Russian resort city of Sochi. In Russia, Kerry said there is no alternative to direct talks between key decision-makers on complex global issues such as armed conflict in Ukraine and Syria.