Probably not. The worst thing America could do is unfreeze Russia's assets and give them back a few billion dollars to fund the war effort. Europe wouldn't permit America to join on the side of a Russian coalition, and America's Navy isn't capable of European operations without Europe's support. We could realistically offer limited air support and strategic nuclear threats, but Russia already has both of those.
The good news is that the Biden administration put most of the frozen Russia assets under European control, anticipating this kind of risk, but of course that doesn't mean Trump can't attempt to pressure Europe here.
