North Korea fired a missile on Friday that experts said was capable of hitting Los Angeles and other U.S. cities and the United States and South Korea responded by staging a joint missile exercise.
North Korea confirmed the launch on Saturday, with its official news agency saying it was a "stern warning" for the United States. President Kim Jong Un said the missile showed that all of the United States was within striking distance but U.S. authorities characterized that as an exaggeration.
The administration of U.S. President Donald Trump, which has branded North Korea the "most urgent and dangerous threat to peace," condemned the launch as reckless.
"By threatening the world, these weapons and tests further isolate North Korea, weaken its economy, and deprive its people," President Donald Trump said in a statement. "The United States will take all necessary steps to ensure the security of the American homeland and protect our allies in the region."
South Korean Defense Minister Song Young-moo said at a news conference on Saturday Seoul would prepare independent measures to curb the nuclear threat from the North.
"This ballistic missile launch by North Korea is a serious provocation that not only clearly violates the U.N. Security Council's numerous resolutions but also threatens the safety of the Korean peninsula and world peace," Song said. "The joint governments of South Korea and the United States will firmly punish North Korea for its missile provocation."
He said steps would be taken to hasten the temporary deployment of THAAD anti-missile units from the United States.
The unusual late-night launch added to exasperation in Washington, Seoul and Tokyo over Pyongyang's continuing development of nuclear weapons and intercontinental ballistic missiles (ICBMs). Friday's test prompted U.S. and South Korean military officials to discuss military response options.
The North Korean military had already raised alarms early this month with its first ICBM launch.
The top U.S. military official, Joint Chiefs of Staff Chairman Joseph Dunford, and Admiral Harry Harris, commander of U.S. Pacific Command, spoke by phone with the top South Korean military official, General Lee Sun-jin, to discuss military response options to the launch.
The Trump administration has said that all options are on the table, including military ones, however it has also made clear that diplomacy and sanctions are its preferred course.
Following a meeting of South Korea's National Security Council, South Korean President Moon Jae-in said he wanted the U.N. Security Council to discuss new and stronger sanctions against the North, the presidential Blue House said.
Later the United States and South Korea conducted a live-fire ballistic missile exercise in a display of firepower in response to the missile launch, the U.S. military said.
The two allies had staged a similar exercise after the North Korean test earlier in the month.
The launch from North Korea's northern Jangang province took place at 11:41 p.m. (1441 GMT), an official at South Korea's Office of the Joint Chiefs of Staff said.
Japanese Chief Cabinet Secretary Yoshihide Suga said the missile flew for about 45 minutes before apparently landing in the waters of Japan's exclusive economic zone. Japanese broadcaster NHK, citing a military official, said the missile reached an altitude of more than 3,000 km.
U.S. cities in range
The South Korean military said the missile was believed to be an ICBM-class, flying more than 1,000 km and reaching an altitude of 3,700 km. In Washington, the Pentagon also said it had assessed that the missile was an ICBM.
U.S. officials said the Defense Intelligence Agency (DIA), the Pentagon spy agency, has determined that North Korea will be able to field a reliable nuclear-capable ICBM by next year, earlier than previously thought.
Jeffrey Lewis of the California-based Middlebury Institute of International Studies said the launch showed Los Angeles was within range of a North Korean missile, with Chicago, New York and Washington, just out of reach.
"They may not have demonstrated the full range. The computer models suggest it can hit all of those targets," he said.
The U.S.-based Union of Concerned Scientists said its calculations showed the missile could have been capable of going as far into the United States as Denver and Chicago.
Michael Elleman of the International Institute for Strategic Studies said the window for a diplomatic solution with North Korea "is closing rapidly."
"The key here is that North Korea has a second successful test in less than one month," he said. "If this trend holds, they could establish an acceptably reliable ICBM before year's end."
John Schilling, an aerospace expert and a contributor to 38 North, a Washington-based North Korea monitoring website, said the improved performance over the previous test could have been the result of a lighter payload as part of an effort to demonstrate that the missile could hit the U.S. capital.
Los Angeles would be protected by the U.S. missile defense network, which includes four ground-based interceptors at Vandenberg Air Force base, 150 miles north of the city, and a second battery of 32 missiles in Alaska.
During a test on May 31 the missile defense system shot down an incoming ICBM missile aimed at the U.S. mainland and a Pentagon spokesman said the military had "confidence in our ability to defend against the limited threat."
Other authorities say the United States may not be able to seal itself off entirely from a North Korean ICBM attack.
A day after sanctions
Trump spoke with Abe and Chinese President Xi Jinping about North Korea's nuclear arsenal this month and has become frustrated that China has not reined in its ally Pyongyang.
Pentagon spokesman Captain Jeff Davis said Friday's launch had been expected and took place from Mupyong-ni, an arms plant in northern North Korea. It came a day after the U.S. Senate approved a package of sanctions on North Korea, Russia and Iran.
U.N. Secretary-General Antonio Guterres condemned the launch of a "ballistic missile of possible intercontinental range," his spokesman said.
A Russian Defence Ministry official said Moscow's data indicated the launch was only of a medium-range ballistic missile, Russian news agency Tass reported. Diplomats say China and Russia only view a long-range missile test or nuclear weapon test as a trigger for further possible U.N. sanctions.
The data on the trajectory indicate the missile was fired at a sharply lofted angle but packed more power than the missile launched on July 4 that U.S and South Korean officials said was an ICBM, potentially capable of hitting the U.S. mainland.
U.S. intelligence officials say that even if North Korea develops a reliable, nuclear-capable ICBM, which some say it remains several steps short of doing, the weapon would be almost useless except to deter the conventional attacks that Kim fears.
"Kim is determined to secure international recognition of the North as a nuclear armed state, for the purposes of security, prestige, and political legitimacy," the National Intelligence Council's January Global Trends report said.