@DimitryZ
When I said that the end game will be US (or US coalition) troops on Red Square will be the end game, I was referring to your double-face and hypocrisy which is mincing hundreds of thousands of Ukrainian best in order to win the war you can't afford (in human lives) to commit. Ukrainian army has no capacity to do so alone, no matter of HIMARS, Leopards, Abrams, whatever. If you want to make Russians surrend, you would need to take care of that yourself.
If you would have a grain of responsibily for this planet and human race, you would work towards peace, not victory.
As you are calling for concrete proposals, I would offer the Russians/Ukrainians the following:
0) Immediate cease of fire and withdrewal of troops.
1) Crimea - it's historically and demographically Russian anyway, 3 to 1 population. You would need to ethnically cleanse 1.5m people to make it Ukrainian. The same principle as Kosovo secession you supports.
2) Scorched lands (Lugansk, Donetsk etc), totally demilitarized and frozen for 10 years. To be decided later, giving the hostility both side showed (Ukr 14-22 and today, Russians 22-23) it should be IMHO some sort of international protectorate. Plus I don't see who's going to rebuild it.
3) Ukraine - EU yes, NATO no. Free to build its army however it wants. Guaranteed access and use of Black Sea (via Odessa or whatsoever).
4. War crimes tribunal, immediately
5) Lifting sanctions to Russia - only once it's fully democratized and dedicated to human freedoms/rights.
This plan will be massively rejected by both sides and I find that as a good starting point.