What would America do if Russia flew a drone over its air space ?

The US and Russia have been playing a silly game for years where one side or the other will send its bombers into the other one's airspace. Of course the intrusion is repelled as fighters are scrambled and they escort the 'enemy' to the exit. I had some friends who flew Canadian fighters and they along with some American counterparts would regularly race to the north to expel the Russians. It was a silly game of cat and mouse that kept the pilots sharp. I often wondered if the Russian and Canadian and American pilots bantered with each other as they went through the motions. "Hey Ivan time for you go home now". "Nyet. I have another hour to meet my weekly training run."