So I've seen Mongol wanks and no mongol timelines, but what about a timeline where the Mongols are successful but not to the degree of OTL? Let's say, for whatever reason, the Mongols either don't go west or don't do much more than raid eastern Iran and Russia, never making it west of the Caspian. Aside from massively improving the fortunes of Persia and Russia (surviving Khwarezmians and Cumans?), do the alt-Yuan manage to last longer in China, do they succeed in conquering or tributizing part of Japan or SE Asia?