It's impossible to completely rule out some sort of US sponsored covert action, but that seems highly unlikely. The risks outweigh any possible rewards. If the operation went wrong and got exposed the political fallout would be catastrophic.
Right now the US is the only country really "winning" the war in Ukraine so there's no need to do anything so crazy.
Right now the US is the only country really "winning" the war in Ukraine so there's no need to do anything so crazy.