Treason

 Elon Musk and Donald Trump conspired to deprive Ukraine of their access to Starshield/Starlink, which they use both for self-defense and for drone attacks. Starshield - as I understand it - is run through the Pentagon, and Ukraine uses it to coordinate attacks on Russian targets. Starlink is a commericial network that use to coordinate defense; Starlink cannot be used for offensive military operations. Slowing both of them down has led to preventable deaths. What's more, it's a clear expression of where Musk/Trump's loyalties lie.

If that wasn't glaringly obvious, Trump decided he was just going to break the law and get money to Putin. This latter thing is a certifiably impeachable offense. Congress explicitly levied increased sanctions on Russia and Trump has decided he's going to do the opposite. That's just textbook lawbreaking.

Most guess that Putin has helped Trump win elections in the past, and Trump thinks Putin can help him again with enough blandishments. Or maybe he really thinks the diesel will somehow, I dunno, reverse the widespread anger over his Iran war and price spikes? 

Of course, the most likely explanation is that Trump admires Putin and hate Zelenskyy, because Zelenskyy is more popular than he is and doesn't bend the knee sufficiently.

Let's hope that Blue Tsunami arrives in a few weeks. Even if it does, it's going to be tricky for Congress to exert control over Trump in this area. Sadly.