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, Seoul said Wednesday, as global condemnation mounted over Pyongyang's likely longest-ever test.
Nuclear-armed North Korea fired an Intermediate-Range Ballistic Missile (IRBM) over Japan for the first time in five years on Tuesday, prompting Tokyo to issue evacuation warnings for some residents.
South Korea and the United States staged a drill of their own in response, firing ground-to-ground missiles into the East Sea, also known as the Sea of Japan, Seoul's military said.
Both militaries fired two ATACMS short-range ballistic missiles into the water "to precisely strike a virtual target," the Joint Chiefs of Staff said.
The military also confirmed that a South Korean missile failed soon after it was launched and crashed, without causing any casualties.
South Korean and US fighter jets had carried out a bombing drill at a virtual target in the Yellow Sea on Tuesday.
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The joint drills aim to "make sure that we have the military capabilities at the ready to respond to provocations by the North if it comes to that," US National Security Council spokesman John Kirby told CNN.
South Korea's military also announced Wednesday that the nuclear-powered USS Ronald Reagan aircraft carrier would return to the area, having already conducted joint drills with Seoul's navy last month.
Pyongyang's Tuesday launch is part of a record year of sanctions-busting weapons tests by the isolated regime, which recently revised its nuclear laws, with leader Kim Jong Un declaring his country an "irreversible" nuclear power.
US President Joe Biden and Japanese Prime Minister Fumio Kishida decried the launch "in the strongest terms" while South Korean President Yoon Suk-yeol called it a "provocation".
The United Nations Security Council was set to meet on Wednesday to discuss the matter.
The IRBM flew about 4,600 km (2,900 miles), Seoul and Tokyo said, likely the longest-ever distance for a North Korean test, which are typically fired on a "lofted" trajectory to avoid flying over neighbouring countries.
Officials and experts said it was likely a Hwasong-12 IRBM, a nuclear-capable missile that North Korea likely first tested in 2017, which has a range that could put US bases on Guam within reach.
North Korea has not commented on the launch in state media.
"Regardless of today's missile launch by the US and South Korean military, North Korea's plan to carry out its next nuclear test will not change," Yang Moo-jin, a professor at the University of North Korean Studies, told AFP.
"It's likely that Pyongyang's going to ridicule today's missile launch -- especially since one of the launches failed -- and proceed with their next nuclear test, given the law changes they made on the nuclear use in September."
The Tuesday test was Pyongyang's fifth missile launch in 10 days.
The spate of launches comes as Seoul, Tokyo and Washington have been ramping up joint military drills to counter Pyongyang's growing threats, staging the first trilateral anti-submarine drills in five years on Friday.
That came just days after the US and South Korean navies conducted large-scale exercises.
Such drills infuriate North Korea, which sees them as rehearsals for an invasion.
US Vice President Kamala Harris visited Seoul last week and toured the heavily fortified Demilitarized Zone that divides the Korean peninsula, on a trip to underscore her country's commitment to South Korea's defence.
About 28,500 US troops are stationed in South Korea to help protect it from the North.
South Korean and US officials have been warning for months that Kim is preparing to conduct another nuclear test, saying last week that this could happen soon after Pyongyang's key ally China holds a Communist Party congress from October 16.
Pyongyang has tested nuclear weapons six times since 2006, most recently in 2017.