"no longer totalitarian"
Pretty sure Putin was literally named leader for life. Putting all your power into a single figure for the rest of their life sounds like a huge stepping stone into totalitarianism. But even then, you admit they are "still our enemy"- something I was willing to forget before the invasion of Ukraine.
Lastly, we as the United States is- or was, the world's sole superpower. Under our leadership Democracy won out across the entirety of the West. The Soviets would crack under attempts of democratic reforms, and even China, perhaps our greatest rival now, struggles today. But all of that will mean nothing if we can't pull ourselves together and rally behind democracy. Ukraine may not be the most pure and uncorrupt democracy but they still manage to put up a democracy, something Russia can no longer say. It is our country's very duty to defend democracy from it's adversaries- the very reason it became a viable superpower, and if that means pumping more money and equipment into an embattled Ukraine then so be it.