RJK (Russia-Japan-Korea) is a submarine telecommunications cable system linking Russia, Japan, and South Korea, all of which border the Sea of Japan. It began operation in January 1995. On Monday, August 16, 2010, Rostelecom announced a transfer of ownership of the undersea cable to the Russian Institute of Pacific Oceanology, with the intended use for research on geomagnetic fields and ceasing any telecommunication use on the line.