Countries that you want to kowtow to Russia have long memories, and surely have the right to be self-determining esp if they have independence which way their loyalties lie.the US inspired NATO militaristic position and act as friendly neighbours. He's shown this with Georgia. He could have gone the whole way across that country and kept total possession. Instead he secured the Georgian President's agreement for no more EU and NATO approaches and then withdrew the Russian troops from all but the small Russian enclave at one edge.
Remember, there wasn't a hint of the Ukraine and Crimea problems while the Ukraine had a government and president friendly towards Russia. The trouble only began with the Orange revolution coup and moves to join the EU and NATO.
The Soviet invasion of Poland was a Soviet military operation that started without a formal declaration of war on 17 September 1939. On that morning, 16 days after Germany invaded Polandfrom the west, the Soviet Union invaded Poland from the east.
What about the corruption of the Russian looking President Yanukovyc who fled when his game was up. So this is NATO and EU's fault - right...
https://www.pri.org/stories/2016-07-26/ukrainians-vowed-turn-their-ex-president-s-estate-museum-corruption-it-s