I find the boast about ending the war to be reasonably likely -- if it is clear the US is switching sides in the conflict, a negotiated capitulation could happen pretty quickly.
In a similar vein, solving world hunger is closer today than it's ever been. The previous best hope was global thermonuclear war, but honestly that would leave enough survivors as to be mostly ineffective, and much more likely to have the opposite result. Severe climate change has a better shot at fully eliminating [human] hunger.
