In March 2012 I was the J2 for the JTF supporting the JSDF in the wake of the 9.0 earthquake, tsunami and Fukushima NPP melt down. (4 acronyms in one sentence…a record?)
Sendi (RJSS) got slammed by the tsunami - about a third of its runway was still underwater days later (C-130 could still get in). Unfortunately it was the only strip of usable asphalt for miles that was in the devastated area and not in the Fukushima “hot zone”. But no power, radar or comms.
So the USAF deployed a tactical ATC team to Sendi. They blocked off a chunk of airspace and had relief and support traffic smoothly running in about a day. They didn’t have radar but they set up some procedures and worked with the Japanese civil ATC to get flights safely in and out - VFR to IFR and vice versa.
BTW, we couldn’t bring our ships in close - at first too much junk (like whole houses) dragged out to sea by the retreating tsunami. Then the Japanese ships in close started to get “slimed” by wind blown radioactivity…and then we discovered that Fukushima was “leaking” several thousands of gallons of highly radioactive water into the ocean…I’ll let Navynuke99 explain why steaming through radioactive waters is frowned upon.
My point is that there are several military options that are available and, per Mudspike, none are being used. Heck, we even have a couple of acronyms for it - MOOTW and HUMRO.