Hotel Tango his the nail on the head. I don't care who is in charge of or who owns an aircraft, if I ask for 7700 (even if not an emergency) then I suggest you select it ASAP as I'll have a VERY good reason for asking that you probably have no idea about. I use it when weather avoiding sometimes, you won't follow my instructions so I need the squawk. Otherwise you can do your own coordination with French Military - good luck.