The two planes over the Black sea were identified as Boeing RC-135 and Boeing P-8 Poseidon.
Earlier in the day, the Russian military reported intercepting a Norwegian spy plane over the Barents Sea.
The day before, Russian fighter MiG-29 was scrambled to intercept two Royal Norwegian Air Force planes over the Barents Sea.
The crew of the Russian fighter identified the air targets as the Falcon-20 electronic reconnaissance and electronic warfare aircraft and the Orion R-3C base patrol aircraft of the Royal Norwegian Air Force.
The Norwegian aircraft were not allowed to violate the Russian state border, it added.