There was a massive dip in all those places in the 90s with shock therapy. A lot of people are still worse off in a lot of ways and angry. Hence AfD, Orban, PiS and all those other angry nationalists.

Also, if you want to be fair, you should compare for example Poland to west Germany. Polish workers toil for German capitalists, and yet, somehow, they're getting exploited way more than the German workers. Less pay, worse services, worse infrastructure, less worker's rights. That whole arrangement is super-exploitative. Meanwhile foreigners bought most of that country. Treated like a colony basically.

The Russians got fucked even worse than Poland in the 90s, which resulted in a backlash which Putin made himself the head of. What Russia is doing is self-preservation. Any state with the means to preserve it's sovereignty from a hostile takeover would try to do so, it's not just something an imperialist state would do. Hence Russia is not doing an imperialism here.