Personally, I think that the Kwantung Army, which is known as "Japan's elite", is actually just powerful in the eyes of the Chinese and their good feeling about themselves, and the Soviet Union is well prepared for a war with Japan.

First of all, the "powerful" power of the Kwantung Army is actually the power in the eyes of the Chinese people and Japan's self-esteem. This seemingly powerful Kwantung Army was really weak and pitiful in front of the United States and the Soviet Union.

When the Soviet Union entered Northeast China, the Kwantung Army stationed here was said to have 700,000 troops, and its weapons, aircraft, tanks, and artillery were all very good. However, Japan and the Soviet Union were not on the same level in terms of strength.

Second, the combat effectiveness of the Soviet Red Army is absolutely winning, at least it defeated the German fascists.

The Second World War broke out in Asia, expanded to Europe, prospered in the Pacific, and ended in Asia. In 1941, the Soviet-German war broke out. Although the Soviet Union performed poorly in the early days, relying on its strategic depth, the endurance of the fighting nation, the industrial strength accumulated before the war, and military assistance from Europe and the United States, under the leadership of Stalin, the Soviet Union had just exhausted the strength of the German armored groups and achieved success. Victory followed several years of defensive warfare in the counterattack.

Obviously, although Japan performed well in World War II, it was intended to bully Asian countries. If Japan were placed on the battlefield in Europe or Africa, its power would definitely lag behind. Not only can it not be compared with the United States, the Soviet Union, Germany, and the United Kingdom, but even Italy, the teammate of the fascist pigs, is not as good as Italy. At the end of World War II, the quantity and quality of heavy weapons such as aircraft, tanks, and artillery were higher than those of Japan. Therefore, it was inevitable that the Japanese Kwantung Army would be defeated by the Soviet Red Army, and the contest between Japan and the Soviet Union was completely one-sided.

Third, the Soviet Union was fully prepared for the war against Japan and the confidentiality of public opinion was in place

According to the Yalta Agreement, the Soviet Union must join the war against Japan within three months after the end of the European war. After the surrender, the Soviet Union began preparations to declare war on Japan, including sending a large number of troops and combat supplies to the Far East coastal areas and the post-Baikal Lake area. Much of this was done in secret to confuse Japan. It is said that in June and July, the Soviet Union transferred an average of 26 troops from the Western Front to the Far East every night. This quickly doubled the Soviet army's strength in the coastal areas and on Lake Baikal. In addition, nearly two large oil depots and warehouses were built for the Soviet army, and a large amount of supplies were stored for the Soviet people.

Why can’t the so-called elite Japanese Kwantung Army resist the Soviet attack?

The most important thing is that the troops deployed by the Soviet army in the Far East are all composite corps, including campaign armies, tank armies and aviation armies, with a total strength of nearly 1.6 million people. Not only do they have a large number of guns, tanks, and aircraft, but they also have two fleets in the Pacific and the Amur River. Judging from the book strength, the 1.57 million Soviet Red Army completely defeated the 750,000 Japanese unofficial army.

Therefore, the Soviet troops attacking the Kwantung Army were not only elites, but also large groups of mechanized troops with almost no combat experience in the Japanese army. In terms of strength, it directly crushed the Japanese army.