My comment was directed specifically at The Thriller's 30,000 foot view of the problem in Washington DC, which is democracy. It isn't the first comment he's made in that direction and I don't think he is wrong there but it is amusing given his earlier concerns over losing our democracy.
Specifically to your question, yes it is the Senators representing the will of their constituents. I think you are deliberately mischaracterizing the sentiment as being pro-Putin or pro-Russia because no Senator is pushing aid for Russia or even a relaxing of sanctions against Russia. There is no large segment of the American population that is pro-Putin, although disturbingly there are some because I've met one, but they're pretty rare. There is an increasing movement of people who are isolationist or at least want some sort of plan with goals that when achieved will mark a completion. The sentiment of "We're there as long as it takes" isn't sitting well with many who are asking "as long as it takes do to what?" or "until who is satisfied?". Americans who believe along those lines are increasing and Senators are duly representing that.