Submarine Brigade 189 was founded on June 20, 2011 and is based in Cam Ranh Naval Base in the central province of Khanh Hoa (Photo: VNA)

It is in charge of operating the diesel-powered 636 Varshavyanka (kilo)-class submarines that Vietnam in 2009 inked deals to buy from Russia to enhance the country's capacity to defend its territorial waters (Photo: VNA)

Russia has already handed over Vietnam six submarines. HQ-182 Hanoi is the first submarine, arrived in Cam Ranh in January 2014. The other fives are named as Ho Chi Minh, Hai Phong, Khanh Hoa, Da Nang, and Ba Ria – Vung Tau (Photo: VNA)

They are 636th kilo-class modern submarines with the quietest engine in the world and are the best choice for reconnaissance and patrols (Photo: VNA)

Prime Minister Nguyen Xuan Phuc inspects HQ-187 Ba Ria – Vung Tau, Canh Ranh port, Khanh Hoa province, February 28, 2017 (Photo: VNA)

Party General Secretary Nguyen Phu Trong inspects HQ-184 Hai Phong, Canh Ranh port, Khanh Hoa province, May 5, 2016 (Photo: VNA)

Owning submarines with modern military equipment helps contribute to strengthening the country's capacity to safeguard its territorial waters (Photo: VNA)

(Photo: VNA)