The S-400 is a Russia-designed mobile surface-to-air missile system (SAM) that's capable of engaging aircraft, UAVs and cruise missiles, and has a terminal ballistic missile defense capability, according to the U.S.-based think tank the Center for Strategic and International Studies (CSIS).

President Volodymyr Zelensky said the death toll might rise and blamed lack of air defenses for the loss of life. Dozens more were reported wounded.

As a result of the operation in the city of Dzhankoy in Crimea, occupied by Russia, carried out on Wednesday in the early morning, we destroyed or severely damaged, among other things, four Russian anti-aircraft and anti-missile S-400 launchers - the Ukrainian military intelligence (HUR) reported on Thursday.