Many to choose from, some are more vocal than others. My guess is Russia - most recently, Soros's fucking with Ukraine gave them a shitstorm of bad press coverage and pretty much cemented their public opinion as "being the bad guys". This is the last fucking thing Putin wants, but he knows he was playing a game stacked against him. All he could do is invade to get back control of his pretty fucking important military assets by the sea.
I'm still distrustful of the man, ages of bad relations between my country and Russia give you that, but the way I see it, pretty much everything I've been told about Putin may not be true.
Oh they tried that and even succeeded with Poland and Smoleńsk. 100% sure now the aircrash was CIA just to screw over our relations with Russia - I still remember all of the REEEEE that our currently ruling party, PiS, was doing fresh afterwards. It seems to have mysteriously died out some time within the last year - almost like Trump's visit was more than just a PR visit.
Poland is ready. As soon as the fight moves to Europe, we are ready to stand with our brothers, both Western and Slavic. Every nation that stands against evil is a nation we will gladly go into the fray with. Za wolność waszą i naszą.