North Korea has fired a ballistic missile from the region of Wonsan on its east coast in an easterly direction, Japan and South Korea's military says, following a series of test-launches of missiles in recent weeks.
The launch was immediately reported to President Moon Jae-in, who has called a meeting of the National Security Council, the South Korean office of the Joint Chiefs of Staff said in a statement.
Japan has protested against the launch of the missile, which appears to have landed in Japan's exclusive economic zone in the Sea of Japan, Chief Cabinet Secretary Yoshihide Suga said.
"This ballistic missile launch by North Korea is highly problematic from the perspective of the safety of shipping and air traffic and is a clear violation of United Nations Security Council resolutions," Suga told reporters in televised remarks.
"Japan absolutely cannot tolerate North Korea's repeated provocative actions. We have strongly protested to North Korea and condemn its actions in the strongest terms."
No damage to planes or ships had been detected, Suga said.
North Korea last test-fired a ballistic missile on May 21 towards the sea off its east coast and on Sunday said it had tested a new anti-aircraft weapon supervised by leader Kim Jong Un.
US President Donald Trump has been briefed about the test, a White House official said.
"The United States government is aware," the White House official said. "The president has been briefed."