SEOUL, South Korea (AP) 鈥 North Korea test-fired an intercontinental ballistic missile for the first time in almost a year Thursday, demonstrating a potential advancement in its ability to launch long-range nuclear attacks on the mainland U.S.

The launch was likely meant to meant grab days ahead of and respond to condemnation over the North's reported to Russia to support its war against Ukraine. Some experts speculated Russia might have provided technological assistance to North Korea over the launch.

North Korean leader Kim Jong Un observed the launch, calling it 鈥渁n appropriate military action鈥 to show North Korea鈥檚 resolve to respond to its enemies鈥 moves that have threatened the North鈥檚 safety, according to the North's state media.

Kim said the enemies鈥 鈥渧arious adventuristic military maneuvers鈥 highlighted the importance of North Korea鈥檚 nuclear capability. He reaffirmed that North Korea will never abandon its policy of bolstering its nuclear forces.

North Korea has steadfastly argued that advancing its nuclear capabilities is its only option to cope with the expansion of though Washington and Seoul have repeatedly said they have no intention of attacking North Korea. Experts say North Korea uses its rivals' drills as a pretext to enlarge its nuclear arsenal to wrest concessions when diplomacy resumes.

The North Korean statement came hours after its neighbors said they had detected the North's first ICBM test since December 2023 and condemned it as a provocation that undermines international peace.

South Korea鈥檚 Joint Chiefs of Staff said North Korea could have tested a new, solid-fueled long-range ballistic missile on a steep angle, an attempt to avoid neighboring countries. Missiles with built-in solid propellants are easier to move and hide and can be launched more quickly than liquid-propellant weapons.

Japanese Defense Minister Gen Nakatani told reporters the missile鈥檚 flight duration of 86 minutes and its maximum altitude of more than 7,000 kilometers (4,350 miles) exceeded corresponding data from previous North Korean missile tests.

Having a missile fly higher and for a longer duration than before means its engine thrust has improved. Given that previous ICBM tests by North Korea have already proved they can theoretically reach the U.S. mainland, the latest launch was likely related to an effort to examine whether a missile can carry a bigger warhead, experts say.

Jung Chang Wook, head of the Korea Defense Study Forum think tank in Seoul, said it's fair to say the missile in Thursday's launch could carry North Korea's biggest and most destructive warhead. He said the launch was also likely designed to test other technological aspects that North Korea needs to master to further advance its ICBM program.

North Korea has made strides in its missile technologies in recent years, but many foreign experts believe the country has yet to acquire a functioning nuclear-armed missile that can strike the U.S. mainland. They say North Korea likely possesses short-range missiles that can deliver nuclear strikes across all of South Korea.

There have been concerns that North Korea might seek Russian help to perfect its nuclear-capable missiles in return for its alleged dispatch of to support Russia鈥檚 war against Ukraine. U.S. Defense Secretary Lloyd Austin said Wednesday that North Korean troops wearing Russian uniforms and carrying Russian equipment are , in what he called a dangerous and destabilizing development.

Lee Choon Geun, an honorary research fellow at South Korea鈥檚 Science and Technology Policy Institute, said the early results of Thursday鈥檚 launch suggested Russia might have given a key propellant component that can boost a missile鈥檚 engine thrust. He said that a higher thrust allows a missile to carry a bigger payload, fly with more stability and hit a target more accurately.

Jung said he speculates Russian experts might have given technological advice on missile launches since Russian President North Korea for a meeting with Kim in June.

Kwon Yong Soo, an honorary professor at South Korea鈥檚 好色tv Defense University, said that North Korea likely tested a multiple-warhead system for an existing ICBM. 鈥淭here鈥檚 no reason for North Korea to develop another new ICBM when it already has several systems with ranges of up to 10,000 to 15,000 kilometers (6,200 to 9,300 miles) that could reach any location on Earth,鈥 Kwon said.

The North Korean confirmation of an ICBM test was unusually quick since North Korea usually describes its weapons tests a day after they occur.

鈥淣orth Korea could have probably thought that its rivals could look down it after it gave away so much in military resources to Russia," Yang Uk, an expert at South Korea鈥檚 Asan Institute Institute for Policy Studies. 鈥淭he launch may have been intended as a demonstration to show what it鈥檚 capable of, regardless of troop dispatches or other movements.鈥

The U.S., South Korea and Japan released a joint statement Thursday condemning the missile launch, saying it was in 鈥渇lagrant violation鈥 of numerous U.N. Security Council resolutions. The foreign ministers of the three countries also condemned the deepening military cooperation between North Korea and Russia, particularly the deployment of North Korean troops to Russia.

鈥淲e strongly urge (North Korea) to immediately cease its series of provocative and destabilizing actions that threaten peace and security on the Korean Peninsula and beyond,鈥 they said.

U.N. Secretary-General Antonio Guterres strongly condemned the launch, which clearly violates U.N. Security Council resolutions banning North Korea鈥檚 use of ballistic missile technology, the U.N. spokesman said.

The U.N. chief reiterated his call for de-escalation on the Korean peninsula and establishing an environment for dialogue and the resumption of talks, stressing that 鈥淒iplomatic engagement remains the only pathway to sustainable peace and the complete and verifiable denuclearization of the Korean Peninsula,鈥 spokesman Stephane Dujarric said.

South Korean military spokesperson Lee Sung Joon said the North Korean missile may have been fired from a 12-axle launch vehicle, the North鈥檚 largest mobile launch platform. The disclosure of the new launch vehicle in September had prompted speculation North Korea could be developing an ICBM that is bigger than its existing ones.

South Korea鈥檚 military intelligence agency that North Korea has likely completed preparations for its seventh nuclear test as well. It said North Korea had been close to testing an ICBM.

In the past two years, Kim has used Russia鈥檚 invasion of Ukraine as a window to ramp up weapons tests and threats while also expanding military cooperation with Moscow. South Korea, the U.S. and others say North Korea has already shipped artillery, missiles and other convectional arms to replenish Russia's dwindling weapons stockpiles.

North Korea鈥檚 possible participation in the Ukraine war would mark a serious escalation. Besides Russian nuclear and missile technologies, experts say Kim Jong Un also likely hopes for Russian help to build a reliable space-based surveillance system and modernize his country's conventional weapons. They say Kim will likely get hundreds of millions of dollars from Russia for his soldiers' wages if they are stationed in Russia for one year.

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