So, I'm thinking more about my idea for a timeline involving portals between OTL and FoM opening up, and I'm thinking about the details a bit more.
-On our end, the portals would probably open up in early February 2019 to prevent meta stuff involving FoM already existing as a work of fiction. But, on the other end, it would be February 2020 so that all the events that happened in the 2019 of FoM would still be canon.
-Not all nations would get portals (especially since some nations would just lock down the portals to the other side immediately for ideological reasons.) Instead, only a handful of nations would get portals. Said nations then become more influential on the global political stage for fairly obvious reason.
-Since the PoD is in early 2019, I don't know if COVID will still be a thing. At any rate, both its presence or its absence would have major effects on the world stage.
Also, for more political effects:
-OTL Mongolia is... suspicious of the RoC, to put it mildly, and becomes closer to the PRC as a result. Conversely, FoM's Tibet and East Turkestan don't like the PRC. Central Asia in general is a region of competition between the China's.
-Depending on which European nations get portals, the EU could end up in serious trouble. I don't know the full list of European nations that have direct access to the other side, but Italy and Slovenia will definitely both have portals.
-The HIV vaccine is going to be a major political issue and/or bargaining chip, with some saying that political concessions to the other side (such as, for example, changing their foreign policy regarding Baathists and the PRC) should be made to get the vaccine, while others say that OTL has to make its own vaccine and not make concessions.
-If COVID is still a thing, I can see people on FoM's side panicking and fear mongering about our world sending it to theirs as biological warfare or something like that.