Only they can answer that (I hope). Even if they did, I suppose USAPA/East could just sit down on the floor and hold their breath until they turn blue and refuse to move (or flop over, which ever occurs first) and then what ?

Either way, they are still AWOL in reality and the eyes of the other parties.

USAPA left the door open for return, so it would seem they aren't ready to walk off a cliff without recourse quite yet and are doing whatever behind the scenes while waiting for the next moves by Silver and the arbitrators to finalize that next move. Just a guess, though............