Those countries WANTED to join NATO. The soviet occupation of Eastern Europe was against the will of the people of those nation, for the most part. The soviet occupation was brutal, intrusive and deadly. NATO nation thrived economically while those soviet satellites stagnated in the rubble left by the war. If NATO falls apart, Belarus, all of Ukraine, Poland and at least some of the Baltic states would be re-occupied. Russia has just put a hundred thousand troops with tanks, missiles and artillery in Belarus on the border with Poland. Putin will wag the dog if he thinks his grip on power is threatened, from within or from outside.

You don't care what Trump's personal dealings with Russia are or were, but many Americans including myself, care very much. I don't want a president who is vulnerable to pressure or is legally or ethically compromised. Mueller's investigation may clear that question up. Since you don't care either way, you should have no say in it.