Russian defence firms such as United Aircraft Corporation (UAC), United Engines Corporation (UEC), United Shipbuilding Corporation (USC), Russian Helicopters and Ural Vagonzavod have in principal agreed to facilitate repair and maintenance of Su-30MKI aircraft, Mi-17 helicopters, Mig-29K jets, T-90 tanks and the aircraft carrier INS Vikramaditya through joint venture and technology transfer with Indian companies.