Everyone who was abused by a superpower is nervous and would like the same help. What's the point in making that list to support your point if you're not going to paint the other half of the picture which is making the opposite point?
Cuba would have loved to not be cut off from the world for more than half a century for doing what the Ukraine was just enticed to do. Palestine could use some help in what has to be one of the most unbalanced displays of power in a conflict in recent memory. The Middle East or Western Asia would have looked decidedly different without the "explosive support system" they received over the decades. And the South China Sea countries could use a hand settling their territorial disputes.
If you can't see how Russia would like the West to stay away from their borders (Ukraine) just as much as the US wanted Russia to stay away from their borders (Cuba) then maybe it's a good moment to take a step back and look at this without thinking of the names. If you care more about allegiance then you can't care about objectivity or history.
Cuba became the enemy of the US the moment they showed any allegiance to Russia. Was there a doubt in anyone's mind that the exact same thing would happen again when the tables are turned? If you're not educated by mass-media then the outcome was obvious. And you are free to wonder why would anyone approach a an enemy superpower's neighbor for an alliance, knowing full well that probably without exception in the history of mankind this lead to war.
I am fairly certain the EU could live with Ukraine as a buffer zone if that means no conflict in Europe and not crippling them. There are forces far enough from Europe who have no such concern about poking a hornets' nest and sacrificing/destroying Ukraine in the process.