I don't think such an argument stand for long, given what's known of the relative strengths and equipment of the prospective combatants, to say nothing about the effects that an Anglo/Soviet conflict in Europe would have in the Pacific.
Only an autocracy can effectively implement such "stab the ally in the back" maneuvers, though, and I'm quite glad I live in a society where it isn't possible.
BTW, it is entirely possible Stalin might have tried a "pre-emptive strike" of this type had not the Bomb given him excellent reason to reconsider any such plans he may have had.