Soviet monitor Khasan
Khasan was a seagoing monitor and lead ship of her class of the Soviet Union. She was named after the Battle of Lake Khasan, a battle that took place near the town of Khasan near the Korean border in 1938 between the Soviet Union and the Empire of Japan. Khasan was active throughout World War II but did not participate in combat. Khasan was notable for being the largest river-going monitor ever built. All three ships survived the war and would continue to serve in the Soviet Navy until 1960. Khasan was laid down 15 June 1936, the same date as both her sister ships, and.
Design
Perekop was designed to operate on the Amur River and on the Strait of Tartary between Outer Manchuria, Sakhalin and Japan to protect against the threat the Japanese empire posed against the Russian Far East. Relations between the two countries were poor and a low intensity conflict had been waged by the Soviet Union and Japan since 1932. Planning on her design began in 1935, using an old, unused design from 1915 as its basis. Khasan was armed with three twin 130mm B-28 guns, two twin 76.2mm 76 mm [air defense gun M1938|39-K] anti-aircraft guns at the aft, and three twin 45mm 45 mm [anti-aircraft gun (21-K)|41-K] anti-aircraft guns. In addition she carried an array of heavy machine guns and carried naval mines. Plans for a fourth twin 130 mm turret and a seaplane hangar were scrapped due to overloading issues.Khasan was protected by steel belt armour ranging from 77 mm amidships to 36 mm at both ends of the ship. The citadel was closed by 25 mm bulkheads. Khasan possessed an armoured deck was 40 mm thickness amidships and 25 mm of protection at the fore and aft. The conning tower and turrets had 50–100 mm protection, and machine gun turrets had 10 mm armour protecting them.
Khasan had a small forecastle allowing for limited high seas capabilities along the Strait of Tartary and the Amur River Basin. The flat bottom hull and bows of the ships were stiffened, giving the monitors icebreaking capabilities.