Why is Ukraine so busy recently?

There was a war there, and the Slavic nation itself was splitting. Can you be quiet?

Causality:

1. In history, the Grand Duchy of Kiev (Kiev region, which is almost the piece of Ukraine now) was stronger than the Grand Duchy of Moscow (the predecessor of Russia), and it was not directly defeated by Russia (killed by the Polish-Lithuanian Principality), so Ukraine never trusted Russia;

Note: Look at the climatic and geographical conditions to understand why Kiev used to be good, and Moscow itself is a nightmare mode.

2. During the period of the former Soviet Union, Khrushchev once drew a place to join Russia (Crimea, which belonged to Russia during the period of the Grand Duchy of Moscow) to join Ukraine (unexpectedly laid the groundwork for Russia to send troops);

3. After the disintegration of the former Soviet Union, Ukraine moved closer to Europe and the United States, and it has always been disgusted with Russia (no natural gas orbit is allowed, joining NATO against Russia and letting Americans deploy anti-missile systems and radar stations), and Russia itself has long complained;

4. Ukrainians engaged in a series of massacres, the key of which was to force a group of relatively pro-Russian people in the east (Ukraine announced that anyone with dual nationality would be sentenced to 10 years in prison, so people in Russian-speaking areas in the east would be imprisoned if they did not rebel), and the result was civil war;

5. As a result, the Russians imitated the "Kosovo referendum" in Crimea and then sent troops to recover Crimea. Europe and the United States can't take Russia and have been deadlocked;