North Korea fired what may have been a submarine-launched ballistic missile from off its east coast on Wednesday, a day after it announced the resumption of talks with the United States on ending its nuclear program.

Axar.az reports citing Reuters.

If confirmed, it would be the most provocative test by North Korea since it started the talks with the United States in 2018. Analysts said it was likely a reminder by Pyongyang of the weapons capability it had been aggressively developing as it gears up for the new round of talks.

A State Department spokeswoman called on Pyongyang to “refrain from provocations” and remain committed to the nuclear negotiations.

South Korea’s military said it had detected the launch of one missile that flew 450 km (280 miles) and reached an altitude of 910 km (565 miles). It was likely a Pukguksong-class weapon, as the North’s earlier submarine-launched ballistic missiles (SLBMs) under development were known.

South Korean Defense Minister Jeong Kyeong-doo told a parliamentary committee that the Pukguksong, or Pole Star in Korean, has a range of about 1,300 km (910 miles) and that the missile’s trajectory may have been raised to reduce the distance it traveled.

A U.S. official, speaking on condition of anonymity, said that, according to initial intelligence, the missile was a submarine-capable ballistic missile launched from a platform at sea.

South Korea expressed concern and Japanese Prime Minister Shinzo Abe condemned the launch, saying it was a violation of U.N. Security Council resolutions.

North Korea rejects U.N. Security Council resolutions that ban Pyongyang from using ballistic missile technology, saying they are an infringement of its right to self-defense.

U.N. Secretary-General Antonio Guterres is “very concerned” about North Korea’s missile launch ahead of Pyongyang’s talks with the United States, U.N. spokesman Stephane Dujarric said.

“The Secretary-General hopes that both parties work to sustain these talks and to make progress” towards denuclearization and peace on the Korean Peninsula, Dujarric said.