No need to single out Baltics really. The same happened everywhere.

Then they accused Lithuanians, Ukrainians and the Polish of nationalism during 1980s independence movements, the same nationalism they actively helped create since 1945.

Let's please remember that inside USSR the first such movement to gain traction was the one of NK's unification with Armenian SSR. And also the first one to be met with force. Independent Azerbaijan basically took the matter where USSR's central government left it.

Dunno why I'm trying to make a case of NK's independence being as solid as that of Baltic countries or something. It's not about laws, but about strength anyway. All the "international institutions" have made it clear that any principle is sold cheap.

the same nationalism they actively helped create since 1945.

Actually since middle 30-s Soviet ideology started turning in that direction. During WWII this, of course, accelerated with war propaganda.