Three countries that Israel fears most:

1. The United States: Israel is supported by the United States, but in some historical periods, especially when it comes to the nuclear issue in the Middle East, the positions of the United States and Israel are different.

2. Russia: The relationship was tense during the Cold War, but with the rise of Russia and the changes in the international situation, the relationship between Russia and Israel gradually improved.

3. Iran: Hostility goes back to ancient times. Because of the conflict of interests between the two countries in the Middle East, especially since the emergence of the Iranian nuclear issue, Israel has been worried about Iran's nuclear weapons development plan.