Later, Vietnam received new Kamov Ka-27PL anti-submarine helicopters from the Soviet Union. After 1991, the Soviet Union disintegrated, Vietnam no longer received aid but continued to receive modern Kamov Ka-28 anti-submarine helicopters through purchase from Russia. Currently, Kamov Ka-28 is the main anti-submarine weapon of the Naval Aviation force. In addition, Vietnam also purchased 10 Kamov Ka-32T helicopters designed similar to Ka-25/28 but for transport and rescue purposes.