NATO has attacked other countries. Fact.
Russia has realized that the Soviet Union was too big and unruly a thing to exist. The hard core socialist scheme the same.
They have not desired expansion for a long time now. But in return they requested that NATO not expand around them.
I really think that the U.S. is the one that was most worried about Russia and Western Europe coming to best of terms and integration. Russia kept trying for decades to improve relations and trade with Western Europe. And it did happen to some extent. To mutual benefit.
But that would increase the power of Europe in general. And then China rising up in power as well.
So the U.S. via NATO, Ukraine, stirs the pot.