North Korea fired off two apparent ballistic missiles on Saturday morning, Japan's Defense Ministry said, marking the first time the nuclear-armed country has conducted four launches in a single week.

The Defense Ministry said both appeared to have splashed down in the Sea of Japan, outside Japan's exclusive economic zone, which extends 200 nautical miles (370 kilometers) from its coast.

Saturday's launch were the North's sixth and seventh missiles fired since the start of the week. It fired two short-range ballistic weapons on Thursday evening, just hours after U.S. Vice President Kamala Harris visited South Korea for talks with President Yoon Suk-yeol in Seoul, where she condemned Pyongyang's “provocative nuclear rhetoric.” The isolated country also tested two short-range missiles on Wednesday and one on Sunday.