I got this idea from reading around some other threads about Tsarist Russia. The challenge is to find some way for Russia to gain a new Tsar(Tsarina) that has support from the United States and Great Britain.
Feel free to use any scenario you wish, like the time-honored story of Anastasia surviving in some way, the Bolsheveiks never take power, or another civil war erupts after Stalin dies. The Western Powers don't have to intervene directly (i.e. sending troops), they can demand concessions be made, but they must support the new monarchy in some way shape or form.