It would seem the Americans are down playing the event with their diplomatic language and not wanting to escalate the situation.
Surely agreement to do this must have come from a seriously high level in Moscow.
Makes me wonder what the back channel conversations are like at the moment - probably quite sporting.
Also wouldn't surprise me if this doesn't herald in the transfer of F16s, something that could clear the Black Sea of Russian Aircraft and Ships, that would be a delicious own goal.