Asked about additional supplies of Russian S-400's to the occupied peninsula, Sevastyanov said that "yes, this is all provided for, but I am not going to discuss the terms," RIA Novosti reported.

He added that both the S-300 and S-400 missiles will be on combat alert on the annexed peninsula.

Read alsoLithuania tells NATO to act over build-up of Russian missiles - The Times"The advantage is on the side of S-400, as it is a more modern, digital system," he said.

As UNIAN reported earlier, according to the head of the press center of Ukraine’s Air Command "South" Volodymyr Kryzhanovsky, the S-400 "Triumph" missile systems deployed in the annexed Crimea are a component of Russia’s air defense network, adding that they pose no direct threat to Ukraine.