People watch a television broadcast showing a file image of a North Korean missile launch at the Seoul Railway Station on Oct. 28, 2022 in Seoul, South Korea. North Korea fired two short-range ballistic missiles toward the East Sea on Friday, the South Korean military said, as Seoul's major military exercise drew to a close. GETTY IMAGES

North Korea fired two short-range ballistic missiles toward the sea on Friday in its first ballistic weapons launches in two weeks, as the U.S. military warned the North that the use of nuclear weapons "will result in the end of that regime."

South Korea's military detected the two launches from the North's eastern coastal Tongchon area around midday on Friday, Seoul's Joint Chiefs of Staff said in a statement. It said both missiles flew about 140 miles at a maximum altitude of 15 miles.

The statement said South Korea strongly condemns the launches, calling them "a grave provocation" that undermines regional peace and violates U.N. Security Council resolutions banning any ballistic activities by North Korea.

The U.S. Indo Pacific Command said the launches highlighted the "destabilizing impact" of North Korea's illicit nuclear weapons and ballistic missile programs. The Japanese Defense Ministry said it also detected the launches and that the type of missiles used and their flight information were still being analyzed.

South Korea's Foreign Ministry said its top nuclear envoy held separate phone talks with his U.S. and Japanese counterparts soon after the launches. It said the three agreed to strengthen trilateral coordination on North Korea while repeating their calls for the North to stop weapons tests and return to talks.

The back-to-back launches, the North's first ballistic missile tests since Oct. 14, came on the final day of South Korea's annual 12-day "Hoguk" field exercises, which also involved an unspecified number of U.S. troops this year. Next week, South Korean and U.S. air forces plan to conduct a large-scale training as well.

North Korea sees such regular drills by Seoul and Washington as practice for launching an attack on the North, though the allies say their exercises are defensive in nature.

Next week's "Vigilant Storm" aerial drills are to run from Monday to Friday and involve about 140 South Korean warplanes and about 100 U.S. aircraft. The planes include sophisticated fighter jets like F-35 from both nations, South Korea's Defense Ministry said in a statement earlier Friday.

Since late September, North Korea has launched a barrage of missiles toward the sea in what it called simulated tests of tactical nuclear weapons systems designed to attack South Korean and U.S. targets. North Korea says its testing activities were meant to issue a warning amid a series of South Korea-U.S. military drills. But some experts say Pyongyang has also used its rivals' drills as a chance to test new weapons systems, boost its nuclear capability and increase its leverage in future dealings with Washington and Seoul.

Tongchon, the launch site for the North's Friday launches, is about 37 miles from the inter-Korean land border. The area was closer to South Korean territory than any other missile launch site North Korea has used so far this year, according to South Korea's Defense Ministry.

South Korea and the United States have strongly warned North Korea against using its nuclear weapons preemptively.

But the North appears to be on the verge of conducting a tactical nuclear test, according to U.S. and South Korean officials.

"We think they're ready to go. (North Korean leader Kim Jong-un ) just has to give the thumbs up," a senior U.S. State Department official told CBS News Thursday.

It would mark North Korea's first such test in five years and seventh overall

Rafael Grossi, chief of the International Atomic Energy Agency, said Thursday that a new nuclear test explosion by North Korea "would be yet another confirmation of a program which is moving full steam ahead in a way that is incredibly concerning."

He said the U.N. agency has been observing preparations for a new test but gave no indication of whether an atomic blast is imminent.

The Pentagon's National Defense Strategy report issued on Thursday stated that any nuclear attack by North Korea against the United States or its allies and partners "will result in the end of that regime."

"There is no scenario in which the Kim regime could employ nuclear weapons and survive," the report said. The Pentagon said it will continue to deter North Korean attacks through "forward posture," including nuclear deterrence, integrated air and missile defenses, and close coordination and interoperability with South Korea.

During a visit to Tokyo on Tuesday, U.S. Deputy Secretary of State Wendy Sherman reiterated that the United States would fully use its military capabilities, "including nuclear," to defend its allies South Korea and Japan.

Last month, South Korea's Defense Ministry warned North Korea that using its nuclear weapons would put it on a "path of self-destruction."

In recent days, North Korea has also fired hundreds of shells in inter-Korean maritime buffer zones that the two Koreas established in 2018 to reduce frontline military tensions. North Korea has said the artillery firings were in reaction to South Korean live-fire exercises at land border areas.

On Monday, the rival Koreas exchanged warning shots along their disputed western sea boundary, a scene of past bloodshed and naval battles, as they accused each other of violating the boundary.

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