Sure, the march 1991 referendum supported preserving the USSR, but by that time Poland, Hungary and the baltics had already seceded, and Ukraine had a referendum with an opposite result 9 months later.
Considering that the living standards in (among many other places) Ukraine fell massively as a result of the fall of the USSR, and that the other states that you mentioned are invaders of Iraq and Afghanistan, neither of relevant complaints are serious.
If somebody hates the USSR but not, for example, the current Hungary and Poland, that somebody supports things like colonialism and worse.
Sure, the march 1991 referendum supported preserving the USSR, but by that time Poland, Hungary and the baltics had already seceded, and Ukraine had a referendum with an opposite result 9 months later.
Considering that the living standards in (among many other places) Ukraine fell massively as a result of the fall of the USSR, and that the other states that you mentioned are invaders of Iraq and Afghanistan, neither of relevant complaints are serious.
If somebody hates the USSR but not, for example, the current Hungary and Poland, that somebody supports things like colonialism and worse.