The U.S. abandoned Georgia in the 00s because it was indefensible. The Ukraine is also very difficult to defend, especially since it seems like such a touchy i

The U.S. abandoned Georgia in the 00s because it was indefensible. The Ukraine is also very difficult to defend, especially since it seems like such a touchy issue for Russia. I doubt that Russia would go to full-scale nuclear war over Ukraine but I wouldn't be surprised if there was a small scale use of nuclear weapons on -say- Brussels. And if Russia makes enough of those Oreshnik missiles they could easily take out most of Europe's air forces in one go without going nuclear, and thus change the balance of power in Ukraine. The question really is: at what price Ukraine? Your (1), (2), and (3) are no solutions. Pausing the war now simply means escalating it later. Depending on Trump's understanding of Russia's limits (I say Trump's because he might have a better understanding that the public), (4) may be the only workable option.