Okay, here's a challenge that will hopefully interest you; with a POD no earlier than 1860, and no later than 1890, switch the fates of China and Russia, so Russia becomes reformist(or attempts to!), in the last years of the 20th Century, while China implodes after a period of being one of the world's greatest powers, or even the other superpower alongside the United States, and only retains it's core territories
The only conditions are that, Russia must allow it's westernmost territories(at least Poland, Finland, the Baltics, and part of the Ukraine, if not Belarus as well) to become independent at some point(and may not take them back, unlike OTL, with all except Poland), and China must gain at least some territory relative to OTL(such as Outer Mongolia, and/or part or all of Indochina).
Russia and China may either both go Communist, as in OTL, or both remain empires, or something else, if one prefers.
Bonus points are awarded if either nation is involved with a Cold War versus America that ends between 1985 and 1995, and said Cold War *does not* end in a global atomic war.