North Korean leader Kim Jong Un oversaw the "demonstration" firing of a "new-type tactical guided weapon" on Thursday to send a warning to South Korea against holding a joint military drill with the United States next month, state-run media reported Friday.

The report came after Pyongyang fired two missiles from its east coast into the Sea of Japan on Thursday morning that Seoul says were a new type of short-range ballistic missile that flew about 600 kilometers.

The test was aimed at sending a "solemn warning to the South Korean military warmongers who are running high fever in their moves to introduce the ultramodern offensive weapons into South Korea and hold military exercise," the Korean Central News Agency said.