The second division of the S-400 land-to-air missile system, stationed in the occupied port city of Sevastopol, will primarily control the airspace over Chonhar and Armiansk – the two settlements located on opposite sides of the de-facto administrative border between mainland Ukraine and the Russian-occupied peninsula, RIA Novosti wrote.

Read alsoUkraine Def. Ministry vows to strengthen borders in response to Russia's militarization plans"The task of the second division of the S-400 complex is to timely locate and, if necessary, destroy aerial targets on the Ukrainian side threatening Crimea," the source said.

The invaders said that an echeloned air defense system is being formed in Crimea amid Ukraine’s missile tests conducted in the area recently.