North Korea had test-launched an intermediate-range ballistic missile, but it ended in a failure, South Korea's military said on Sunday.
South Korea's Joint Chiefs of Staff (JCS) said in a statement that North Korea fired what is believed to be a Musudan missile at 12.33 p.m. on Saturday near an airport in North Pyongan province, Xinhua news agency reported.
The test-launch, the JCS said, failed as the missile exploded soon after its lift-off.
The US military mobilised its nuclear-powered aircraft carrier USS Ronald Reagan to participate in the week-long drill, which also involved seven American warships and some 40 South Korean battleships as well as fighter jets, maritime patrol airplanes and helicopters.
On June 22, Pyongyang launched a Musudan medium-range missile, flying some 400 km after reaching as high as 1,413.6 km.
It was seen as a considerable technological advance and the first success by North Korea after several failures.
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