Its either the miltia coming back with their "in case of superhero" armory, Mr. Lord or Major Power to rain on her parade even more, or possibly the UN who are PISSED.
Either way, the answer is probably not good for Fusion.
I just thought of something, WAAAAAAY back when Major Powers was shown in the area on tv... If the SAS can't get in there because of the UN how the hell is Major Asshat the Mighty Clone able to be there with a free day pass?
The SAS is specifically forbidden to take action by the UN. Major Power is able to be there for the same reason that Fusion is: He's not part of a super-team, and as an 'independent', is allowed to do whatever he wants.
The attack that Major Power stopped was inside the U.S. Embassy, so it was technically U.S. territory. Major Power probably violated Darmar's airspace getting there, but the Darmarian government wanted to distance themselves from an act of aggression against the U.S. government more than they cared to split hairs over what was essentially a legal intervention on Major Power's part.
If you come in from high enough, say outer space, then you are not violating air space. Otherwise the ISS/SAS and everything else would be causing a big stink. Outer space by treaty starts at 100km(62 miles). which is much lower than a stable orbit. As a comparison, weather balloons top out about 50km feet. Airliners fly to around 13 km, Mt Everest is 8,848m.
below the outer space limit, and above the airspace granted by the u.s. embassy would be darmarian airspace. this allows airplanes to fly overhead and operate under local law, not sure what the limit is, but i know there is one.
so ya, MP did in fact violate darmarian airspace to reach the embassy. of course proving it is a whole other matter (he could say he magically teleported, but they might just disregard that answer, hence the world of politics and international law).