SEOUL, South Korea — North Korea fired two short-range ballistic missiles off its east coast Wednesday, South Korea’s military said, its second weapons test in less than a week. North Korea is angry over planned U.S.-South Korean military drills and may be trying to boost pressure on the United States to win concessions as the rivals struggle to set up talks over the North’s nuclear weapons.

South Korea’s Joint Chiefs of Staff said Wednesday’s missiles were launched from Wonsan, a city the North pushes as a vacation destination but that it also uses as a regular launch site. The joint chiefs’ statement said both missiles were believed to have flown about 155 miles at a maximum altitude of 19 miles.

“The North’s repeated missile launches are not helpful to efforts to ease tensions on the Korean Peninsula, and we urge (North Korea) to stop this kind of behavior,” the statement said. Japanese Prime Minister Shinzo Abe briefly told reporters the launches were “no threat to Japanese national security.”

Six days earlier, North Korea fired two short-range ballistic missiles that Seoul officials said flew 370 miles before landing in the sea.

U.N. Security Council resolutions ban North Korea from using ballistic technology in any weapons launches. But it’s unlikely that the nation, already under 11 rounds of U.N. sanctions, will be hit with fresh punitive measures. Past sanctions were imposed only when the North conducted long-range launches.