Again, that’s only if Ukraine wins though. A rebuild only happens if they drive Russia out of their country, retain their sovereignty and have to rebuild their now-liberated cities. You think Ukraine is going to do that?
I don’t know that I’d necessarily give Ukraine credit as opposed to the US taxpayer, but yes there will be a time when the US is rebuilding areas of Ukraine destroyed by Russia. And those areas will probably hate the US for using them as a pawn in a proxy war. A day will come when we abandon them and the next generation of US hating terrorists will emerge. Then we can fight another war on terror.