Pyongyang conducts second weapons test in less than a week as Seoul, Washington gear up for annual military exercises.

North Korea has launched a ballistic missile towards the Sea of Japan, according to Seoul and Tokyo, marking the second such test from Pyongyang in less than a week.

The launch on Wednesday came as South Korea and the United States announced plans to hold their annual Ulchi Freedom Shield military drills starting on August 17.

“Our military detected at around 6:00 am [21:00 GMT Tuesday] a ballistic missile launched by North Korea from the Wonsan area towards the East Sea,” South Korea’s Joint Chiefs of Staff said in a message to reporters, referring to a body of water also known as the Sea of Japan.

South Korea’s military said the missile flew more than 700km (435 miles).

It said it has boosted its surveillance posture and that it was closely exchanging information on the launch with Washington and Tokyo.

Japan’s Defence Ministry said on social media that the suspected ballistic missile had “already fallen”, without providing further details.

“North Korea has never simply let a South Korea-US joint military exercise pass without a response,” Lim Eul-chul, a North Korea expert at Kyungnam University, told the AFP news agency.

“This is a message that Pyongyang is closely watching the upcoming drills and could stage a provocation if it deems one necessary.”

US-South Korea drills

The Ulchi Freedom Shield training is to start on Monday and run for 11 days. Its scale will be similar to previous years, with 18,000 South Korean soldiers taking part, according to South Korea’s military.

North Korea has in previous years denounced the exercises as a rehearsal for invasion, and responded to the drills with weapons tests and harsh rhetoric. Seoul and Washington, however, have repeatedly said their training is defensive in nature.

On August 6, South Korea, the US and Japan detected the launch of a short-range ballistic missile from North Korea in what was Pyongyang’s first ballistic weapons testing activity since late June.

North Korea did not confirm the reported launch.

Pyongyang has ratcheted up its criticism of Tokyo’s defence policy, issuing statements at least seven times since July.

On Tuesday, North Korean state media condemned Japan’s latest defence white paper as a “re-invasion-minded” document, saying it “groundlessly described” Pyongyang as ⁠the greatest strategic challenge to “justify its reckless arms buildup”.

North Korea has also been accused of playing a more active role in the Russian invasion of Ukraine.

Ukrainian President Volodymyr Zelenskyy said on Tuesday that Moscow had used a North Korean ballistic missile during an attack that killed seven workers at a Ukrainian steel plant in the southeastern city of Zaporizhzhia.