RJK (Russia-Japan-Korea) is a submarine cable system linking Russia, Japan and Korea. The RJK cable consists of two fiber pairs, stretches of 1762 Km, with three cable landing station:

• Nakhodka, Russia, Rostelecom;
• Naoetsu, Japan, KDDI;
• Pusan, Korea, KT.

The RJK cable system was designed with 560 Mbps PDH system over each fiber pair. The RJK cable system began operation in January 1995 and retired in 2008.