Haha, the wall of MiGs is long gone!
In my current campaign, the DPRK air force lasted all of six hours. They definitely put up a fight at the start, but were hopelessly out-fought in the air and on the ground (and that's despite the difficulty sliders maxed out to balance out for them). After that, every single one of their air bases was not only obliterated, but would continue to receive a going-over by a strike every couple of hours. Every once in a while a base or two comes back online and sends out a few packages, but they're picked up and blasted out of the sky right away.
Now it seems the same has more or less happened to their ground forces - without any air cover, they just basically got torn to shreds by A-10s & co. It's afternoon on Day 2 now and I don't think they'll last much longer here!