SEOUL, South Korea (AP) — North Korea says leader Kim Jong Un supervised test-firings of an unspecified new weapons system, which extended a streak of weapons demonstrations that are seen an attempt to build leverage ahead of negotiations with the United States.

The report by North Korean state media on Sunday came a day after South Korea's military said it detected the North launching what appeared to be two short-range ballistic missiles into the sea.

North Korea's fifth round of weapons launches on less than three weeks was seen as a protest at the slow pace of nuclear negotiations with the United States and continuance of U.S.-South Korea joint military exercises the North claims are an invasion rehearsal.

Experts say the nuclear talks will likely resume after the drills are over later this month.