On January 18, 1952, Rhee declared South Korean rule over the waters around the Korean peninsula. This was an idea the same as today's exclusive economic zones. The new border, which Rhee called the "Peace Line", included Tsushima Island and the uninhabited islands named Dokdo. This led to protests from the Japanese government. They claimed that the islands were Japanese territory. Minor clashes followed, but the islands have been under South Korean administration since then.