Ostalgie is indeed mostly about surviving or preventing the collapse of the socialist block (and Collapse: A Political Simulator is about the aftermath of the collapse), but in crisis of the kremlin, although very difficult, you can bring forth the collapse of the US. (I still don't really play it, because I find the game difficult to understand and some things seemingly make no sense, that's why I anxiously await the sequel). I still haven't looked at China's: Mao's Legacy (as I think I should study the subject some more before trying it), so I don't know how much you can kick the US in the balls with the DLC.
But yeah none of those games are grand-strategy wargames.
Wasn't it south Korea who started the rumour that the DPRK was planning on sending troops to Russia to fight Ukraine?