My own nightmare is a lot less than that, but still bad. Mine is that, one day, all in the same day, IRBMs, cruise missiles and the odd spec ops guy from the PLA and other Axis forces, blow away Guam, Okinawa, Diego Garcia, and various bases in Japan and Taiwan. The PLA surges down the newly constructed Kunming - Bangkok Highway and also, expeditionary forces of joint PLA-Myanmar-Pakistan troops jump down onto the Isthmus of Kra in order to soften up Southern Thailand and Northern Malaysia. A day later, the mass of invasion forces that have by now secured and passed Bangkok meet the expeditionary forces and their mantra is "Singapore or bust." Meanwhile, across the Middle East, war has also broken out and South Korea is getting pounded. In Europe, with shock and awe, Russians, and Belarussians are surging toward Berlin and Vienna. The tac nukes in Kaliningrad have been unleashed on all NATO targets within their range. Meanwhile, CONUS we are getting hit by 100 9/11s ranging from attacks on small towns to big jobs on major targets. Confused and somewhat in disbelief about reports we are getting from Europe, we ask the Russians for help and they laugh. Their final comment is something to the effect of "even we could not believe how many supposed conservatives in your country down played the 7/16/2001 treaty and the Shanghai Cooperation Organization. We are now your masters. If you do not comply, the missiles shall fly within the hour"
FYI ... similar to your scenario.