These talking points are very partisan and ignore the fact that Russia's 2014 annexation of Crimea is what started the entire chain of events. We're not dealing with a peaceful or reasonable regime.

A. Ukraine war likely could have been avoided diplomatically

What was the diplomatic solution? Have Ukraine give up (even more) of their country to Russia because they want it? Have the US (and others) tell Ukraine how to decide the fate of their country? That's preferable?

B. US is not actively trying to solve the war diplomatically

For all but 4 years of the United States' history, we have done diplomacy behind closed doors (not on Twitter or through press releases) like every other country. Of course you're going to talk tough in public... it's a constant negotiation. They even acknowledged this in earlier podcasts and said talk gets the toughest right before a deal gets done. The real diplomacy is getting done through backchannels the same way it was in the Cold War.

C. US and NATO is open to Ukraine joining the alliance which is a red line for Russia

See point B. This is a bargaining chip. It might come off the table and Russia can claim that victory.

The rest of your points are all along the same partisan lines. Sacks (and the Right) wouldn't be making 90% of these claims if a Republican was in charge, and the Left would. There's very little honest criticism you can lay without knowing the facts behind closed doors which no one here (or on the pod) has.