(Yonhap photo)

SEOUL – North Korea fired an intercontinental ballistic missile (ICBM) toward the East Sea on Friday, the South Korean military said, in apparent protest over the United States' move to reinforce its "extended deterrence" protection of South Korea and Japan.

The Joint Chiefs of Staff (JCS) said it detected the launch from the Sunan area in Pyongyang at 10:15 a.m., and that the missile flew about 1,000 km. at an apogee of about 6,100 km. at a top speed of Mach 22.

The launch is presumed to have involved the Hwasong-17 ICBM, according to an informed defense source who requested anonymity.

On November 3, the North test-fired the same ICBM, but the launch was seen as a failure.

US President Joe Biden has been briefed on the North's latest provocation, and the White House strongly condemned it.

"This launch is a brazen violation of multiple UN Security Council resolutions and needlessly raises tensions and risks destabilizing the security situation in the region," it said in a statement. "The United States will take all necessary measures to ensure the security of the American homeland and Republic of Korea and Japanese allies."

The Hwasong-17 is dubbed a "monster" for its sheer size. It is known to carry multiple warheads and has a range of about 15,000 km., long enough to cover the entire US mainland.

"North Korea's ICBM launch this time is a significant provocation and serious act of threat that undermines peace and stability not only on the Korean Peninsula but also in the international community and a clear violation of UN Security Council resolutions," the JCS said in a text message sent to reporters.

It added that the South Korean military would maintain a firm readiness posture capable of responding "overwhelmingly" to any North Korean provocation while tracking and monitoring related North Korean movements in close cooperation with the US.

JCS Chairman Gen. Kim Seung-kyum and Gen. Paul LaCamera, the commander of the South Korea-US Combined Forces Command, held virtual consultations over the launch and reaffirmed their commitment to keeping a more solid allied defense posture, according to the JCS.

The launch came just a day after North Korean Foreign Minister Choe Son-hui warned her country would take "fiercer" military actions if the US strengthens its security commitment to using a full range of military capabilities, including nuclear options, to defend the allies.

Choe's statement stoked concerns that the North is shifting the responsibility for a rise in regional tensions to the US and its allies – in an ominous sign that it is headed toward a bigger provocation, like a nuclear test.

Shortly after her statement, the North lobbed a short-range ballistic missile into the East Sea.

Pyongyang's reaction followed a trilateral summit among President Yoon Suk-yeol and his US and Japanese counterparts, Joe Biden and Fumio Kishida, respectively, on the margins of annual regional gatherings in Phnom Penh on Sunday.

There, the trio agreed to work together to strengthen deterrence, with Biden reiterating Washington's "ironclad" security commitment to Seoul and Tokyo.

The US Indo-Pacific Command also said the US condemns Friday's launch and urges the North to refrain from "any further unlawful and destabilizing acts."

"The US commitments to the defense of the ROK and Japan remain ironclad," the command said, using the acronym for South Korea's official name, the Republic of Korea.

Observers said the North has made headway in its ICBM program, but questions still linger over whether it has mastered the atmospheric reentry technology. (Yonhap)