Isn't this really really common that Russia flies military planes over other nations, for no reason what so ever?
They're regularly being escorted away from Britain.
They gain massive amounts of intelligence by doing so. They:
- learn geographic data to develop invasion/ flight/ combat paths or routes
- obtain key meteorological data related to pressure, wind, and etc. for military purpose
- can use these as shows of force about the capable reach of Russia.
But little do they know we could (and would) mess them up fast.