Sure because Russia has a long history of attacking Western Europe unprovoked. Napoleon, WW1, UK US intervention in the Revolution, Polish Invasion and WW2 clearly had Russia as an Aggressor.
https://en.wikipedia.org/wiki/Hungarian_Revolution_of_1956
https://en.wikipedia.org/wiki/Prague_Spring
or those russian soldiers on holiday in the ukraine.
It's very strongly related to the geography of the region.
https://en.wikipedia.org/wiki/Molotov%E2%80%93Ribbentrop_Pac...
And here's the answer:
https://en.wikipedia.org/wiki/Polish%E2%80%93Czechoslovak_bo...
Check out all of the minor wars Poland was involved in between 1919 and 1938.