North Korea has conducted what is thought to be its biggest missile launch since 2017.
The weapon was apparently an intermediate range missile which reached an altitude of 2,000km before coming down in the Sea of Japan.
Japan, South Korea and the US have all condemned the launch, the seventh test this month.
The UN prohibits North Korea from ballistic and nuclear weapons tests, and has imposed strict sanctions.
But the East Asian state regularly defies the ban, and leader Kim Jong-un has vowed to bolster his country’s defences.
Experts suggest multiple reasons lie behind the spate of launches, including political signalling of strength to global and regional powers, a desire by Kim Jong-un to pressure the US back into long-stalled nuclear talks and also the practical need to test out new engineering and military command systems.
The timing is also seen as significant, coming just before the Winter Olympics in China, and ahead of the South Korean presidential election in March.
And the tests have also surged as the faltering North Korean economy struggles under US-led sanctions, pandemic-related difficulties and decades of mismanagement.
South Korea reported that the launch took place at 07:52 local time on Sunday (22:52 GMT) off North Korea’s east coast.
Japanese and South Korean officials estimated that the missile reached an altitude of 2,000km (1240 miles) and flew for 30 minutes to a distance of 800km (500 miles).
The United States called on North Korea to “refrain from further destabilising acts”.
January was already one of the busiest months on record for North Korea’s missile programme, with several short range missiles fired into the sea.
South Korea’s president, Moon Jae-in, said the latest flurry of tests was reminiscent of the heightened tensions in 2017, when North Korea conducted several nuclear tests and launched its largest missiles, including some that flew over Japan.
According to South Korean news agency Yonhap, the missile appears to be similar to the Hwasong-12 missile that the North tested in 2017.
In 2018, Mr Kim announced a moratorium on testing nuclear weapons or its longest range intercontinental ballistic missiles (ICBMs).
But the North Korean leader said in 2019 he is no longer bound by the moratorium.
The US imposed more sanctions on North Korea earlier in January, in response to previous missile launches. Negotiations between the two countries have stalled.
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