> what happened in the east 85 years ago

Russia got attacked by their ally, Nazi Germany. After 87 years ago in 1939 they invaded together Poland.

> Really sad.

Yeah, Russia going on to win WW II was quite sad. Admittedly better than Nazis winning but pity they have not both lost.

> contrary to the agreements after the fall of the Soviet Union

which supposed agreements? Were they any more binding than Budapest Memorandum?

> Russia said for decades that Ukraine in NATO is unacceptable.

And Russia in Ukraine is unacceptable for us.