Well, if the US is going to nuke Russia like Biden said, they better do it fast. If they don't, there won't be any Ukraine left to save. Of course, it would probably mean nuclear war worldwide. And it certainly would mean Bidem's rating would go to zero. But it might keep Biden in the presidency for an unlimited amount of time (til death). No elections in war.
Do you really think that destroying critical infrastructure of Ukraine will result that there won't be any Ukraine left to save? It's more like desperate attempt to do something when they haven't achieved something in front for last few months.
And with every new attack, less missiles and Shahed's reach it's targets. Ukraine finally is getting more modern air defense systems like IRIS-T, though it's not enough.
You could easily be right about Ukraine NOT being taken off the map. It seems that Putin doesn't really want to do that. However, even though it looks like Russia's abilities are waning somewhat, winter is coming, and Ukraine might simply be gone before the US can get there to help them.