If Putin somehow justifies invading Ukraine, it stands to reason the the USA should liberate Venezuela and Cuba by military force.
Which is certainly why now is a good time for Putin, as that won’t happen with the phony FedGov we have now.
Ukraine was part of Russia for 400 years. Venezuela and Cuba, not so much.
Russia doesn’t want to have Ukraine. It’s a black hole & failing state. If the Ukrainians attack in Donbass, Russia will reunite with the parts of Ukraine that were Russian before Lenin drew the internal Soviet boundary and put them into today’s Ukraine (as Khrushchev did with Crimea). But hopefully that won’t happen.