North Korea fires two ballistic missiles, slams UN meet

North Korea fired two ballistic missiles Thursday, Seoul's military said, as the UN Security Council met to discuss Pyongyang's earlier, highly provocative launch of a missile over Japan.

The launch is Pyongyang's sixth in less than two weeks, and comes two days after it fired an intermediate-range ballistic missile over Japan, prompting Tokyo to issue a rare evacuation warning.

South Korea's military said it had detected two short-range ballistic missiles launched from the Samsok area in Pyongyang towards the East Sea, also known as the Sea of Japan.

"Our military has reinforced monitoring and surveillance and is maintaining utmost readiness in coordination with the United States," Seoul's Joint Chiefs of Staff said in a statement.

Japan's coastguard also confirmed the launch of two potential ballistic missiles, with Prime Minister Fumio Kishida telling reporters that the recent testing spate was "unacceptable".

"Even in this short period since the end of September, this is the sixth time. This is absolutely unacceptable," he said.