Deliver the weapons and the financial aid and leave the fighting to Ukrainians. They don't want western boots on the ground beyond foreign volunteers.

Here's one possible non-violent endgame if Putin is dumb enough to trigger Article 5: https://medium.com/illumination-curated/april-25-russia-ukraine-endgame-2b564512f8c5

Predicting a Russian military collapse already underway isn't necessary. Just listen to Russian soldiers' intercepted conversations is enough: https://www.youtube.com/@insightsfromukraineandrussia/videos

Or watching frozen hypothermic Russian soldiers not reacting to drone bombs: https://www.msn.com/en-us/news/world/russian-soldiers-are-freezing-to-death-in-eastern-ukraine/ar-AA14BIJq

Or listen to Russian soldiers themselves:

https://news.yahoo.com/not-army-russian-soldier-warns-130423534.html

Collapsed militaries whose chain of command evaporates melt away and repatriate, as in Russia in 1918, Germany in 1945, France in 1940. Or they splinter into warlord-led gangs, as in the Freikorps in Germany and the Baltics in 1918-20, Russia's Streltsi in the late 17th century, China's warlord armies in the 1920s and 30s and the post Civil War Confederacy's KKK.

Russia's will follow one of these patterns, or a combination of the two. We can already glimpse this future privatization of violence in Prigozhin's PMC Wagner, whose neo-Nazi founder named for Hitler's favorite composer, and the tik tok warriors of Kadyrov's Chechen mercenaries.

As in the post-1991 dissolution of the USSR, the big problem will be loose nukes. But viewing Ukraine as simply an American pawn and asking it to accept genocidal surrender and erasure because of a fear of loose nukes, as so many western useful idiots do, is a moral and geopolitical absurdity. Ask a simple question: what's the number of additional dead Ukrainian civilians and how much longer will the war last due to each delayed weapons delivery due to decreased public support?