A Russian fighter jet carried out an "unsafe and unprofessional" intercept of a U.S. spy plane over the Black Sea and came within 10 feet (3.05 meters) of the American aircraft, two U.S. defense officials said on Wednesday. ...
It lasted about 19 minutes and involved a Russian Sukhoi Su-27 fighter and a U.S. Navy P-8 surveillance plane flying a regular patrol, said one official, speaking on condition of anonymity.
As long as we aren't intimidated by the Russians, their efforts to bully us away won't prevent us from seeing Russian preparations.
On the other hand, the Russians just might be being jackwads.
So invasion or just being Russian. Hard to say.