Cuba (country right next to the US) aligned itself with the USSR after Castro’s revolution, and the US has attempted to coup them, invade them, murder their leaders, then sink them in isolation and starvation. I’ve always defended that Cuba had the right of self-determination for their own foreign and domestic policy, and that the US was in the wrong for retaliating against them.
It would be extremely hypocritical of me to defend that Ukraine has no right to self-determine whether they want to be in a defensive pact or not, and whether they want to join the EU or not, just because a third country would like them not to do so - just as it’s extremely hypocritical of tankies and campists to say that Cuba had the right to choose their own future but Ukraine doesn’t.