North Korea fired a ballistic missile towards the sea to the east of the Korean Peninsula on Saturday, the South Korean military said.
This is the first missile launch by North Korea in eight days and comes five days after Seoul accused Pyongyang of loosing five drones into South Korean airspace for the first time since 2017.
Japan's coastguard said North Korea had fired what could be a ballistic missile and sent notice about a possible second missile.
Pyongyang fired the missile a day after South Korea's defence ministry announced it had successfully conducted a test flight of a solid-propellant space launch vehicle.
On Monday, five North Korean drones crossed into South Korea, prompting South Korea's military to scramble fighter jets and attack helicopters to try to shoot them down.
One of them travelled as far as northern Seoul, causing security jitters among many people in South Korea and leading the military to offer a rare public apology on Tuesday.
Not counting Saturday, North Korea fired about 70 ballistic missiles about 38 times this year, Yonhap news agency said, including eight intercontinental ballistic missiles.
Some experts say North Korea is seeking to modernise its arsenal and increase its leverage in future dealings with the US.
The Saturday launch came as North Korea begins a major party meeting in Pyongyang to review past policies and new goals for 2023.
Some observers say North Korean leader Kim Jong-un will reaffirm his vow to expand his nuclear arsenal and introduce sophisticated weapons in the name of dealing with what he calls American hostility.
US and South Korea in show of force — in pictures
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A surface-to-surface missile is fired off the east coast of South Korea. Reuters -
The South Korean and US militaries fired a volley of missiles into the sea in response to North Korea firing a ballistic missile over Japan. AFP -
A South Korean F-15K fighter drops two bombs over an island target in response to North Korea's missile launch earlier in the day. Getty -
South Korean and US jets fly over the Korean Peninsula after North Korea's ballistic missile launch. Getty -
A screen shows images of North Korea's leader Kim Jong-un during a news update in Tokyo. North Korea fired a missile over Japan for the first time in five years on October 4. AFP -
A screen in Tokyo displays the trajectory of North Korea's ballistic missile on a map. EPA -
North Korea’s launch of the nuclear-capable ballistic missile was its fifth round of weapons tests in 10 days. EPA -
Col Kim Jun-rak, head of public relations in South Korea's Joint Chiefs of Staff office, gives a briefing in Seoul. EPA
News agencies contributed to this report
