Ukraine was Victoria Nuland's project. Her CIA had a huge hand in the protests against Yanakovich (who was, in turn, an asset of Putin's GRU), and she personally had a hand in negotiating with Yanakovich on behalf of the protestors. You should read about the events in Ukraine in 2014. That overthrow led to the retaliatory capture of Crimea, where the US and EU apparently did not learn their lesson about how much of a madman Putin is.

As for the Biden Ukraine connection, I'm sure Hunter Biden is just secretly very talented at managing oil companies, which is why he was put on the board of Burisma in 2014, after Nuland's little coup. I believe the "10% for the big guy" quote was in reference to this deal, too.

As for this being an existential threat to Europe, I'm not even sure you need to be given the facts about having a madman like Putin edging closer to your borders, while also depending on him for energy.

Finally, on supporting your puppet governments: it's basic game theory that you should do this. Otherwise all the other ones (see much of Latin America) get overthrown.