The Kashtan (Russian: Каштан, English: Chestnut) close-in weapon system (CIWS) is a modern naval air defence gun-missile system deployed by the Russian Navy. It is found on the aircraft carrier Admiral Kuznetsov, Kirov class battlecruisers, Neustrashimy class frigates, China's Sovremenny class destroyers, and other modern designs. Most typically deployed as a combined gun and missile system, it provides defence against anti-ship missiles, anti-radar missiles and guided bombs. The system can also be employed against fixed- or rotary-wing aircraft or even surface vessels such as fast attack boats or targets on shore.