North Korean warplanes stage bombing drill after two ballistic missiles fired

South Korea scrambled fighter jets after North Korean warplanes staged an apparent bombing drill on October 6, Seoul's defence ministry said, as allied warships held missile defence drills and Pyongyang fired off the latest in a series of ballistic missiles.

The rare bombing drill by at least eight North Korean fighter jets and four bombers prompted the South to deploy 30 fighters. The warplanes swarmed each side of the heavily fortified border amid rising tensions over a string of missile tests by Pyongyang, Reuters reports.

North Korea fired two short-range ballistic missiles into the sea on October 6 in the direction of Japan, just an hour after condemning the repositioning of a US aircraft carrier to the region, and a UN Security Council meeting held in New York.

North Korea has launched about 40 missiles this year, including its largest intercontinental ballistic missiles (ICBMs), and appears ready to hold its first nuclear test since 2017, officials in Seoul and Washington have said.

The October 6 launches followed the return of the carrier, USS Ronald Reagan, to waters off the Korean peninsula, and a UN Security Council meeting held in response to the North's recent tests.

The missile launch was the sixth in 12 days and the first since North Korea fired an intermediate-range missile (IRBM) over Japan on October 4, which prompted joint South Korean and US missile drills in which one weapon crashed and burned.

The launch was reported by South Korea's Joint Chiefs of Staff and the Japanese government.

"This is the sixth time in the short period, just counting the ones from the end of September," Japanese Prime Minister Fumio Kishida told reporters. "This absolutely cannot be tolerated."

The launch came after North Korea condemned the United States for talking to the United Nations Security Council about Pyongyang's "just counteraction measures" on joint South Korea-US drills, suggesting its missile tests are a reaction to the allied military moves.

In a statement, the reclusive nation's foreign ministry also condemned Washington for repositioning the US aircraft carrier off the Korean peninsula, saying it posed a serious threat to the stability of the situation.

The carrier and its strike group of accompanying warships were abruptly redeployed in response to North Korea's IRBM launch over Japan. The carrier strike group joined destroyers from South Korea and Japan in maritime missile defence training, the South Korean military said on October 6.