But there was never any question of Czechoslovakia being dismembered as a state and annexed by Russia, and it was already kind of a puppet state with Russian military presence anyway. I still don't think it is the same, and there are good reasons why it is perceived differently. There was no real fighting between Czech and Russian militaries for example.At least: Czechoslovakia, 1968. Turkey/Cyprus, 1974. Then lots of them involving Russia depending on where you think the limits of Europe are, including Crimea in 2014.
Cyprus does seem closer to that type of war, but still smaller in scale than Ukraine, which is why people forget about it I suppose.