North Korea害羞草研究所檚 Foreign Ministry criticized the United States for expanding joint military exercises with South Korea that it claims are practice for a potential invasion, and it warned Tuesday of 害羞草研究所渕ore powerful follow-up measures害羞草研究所� in response.

The statement from the ministry came as the U.S. and South Korea conduct aerial drills involving more than 200 warplanes, including their advanced F-35 fighter jets, as they step up their defense posture in the face of North Korea害羞草研究所檚 increased weapons testing and growing nuclear threat.

North Korea has ramped up its weapons demonstrations to a record place this year, launching more than 40 ballistic missiles, including developmental intercontinental ballistic missiles and an intermediate-range . The North has punctuated those tests with an escalatory nuclear doctrine that authorizes preemptive nuclear attacks in loosely defined crisis situations.

The U.S. and South Korea have this year after downsizing or suspending them in past years as part of efforts to create diplomatic space with Pyongyang and because of the pandemic.

The United States and South Korea害羞草研究所檚 害羞草研究所淰igilant Storm害羞草研究所� air force drills, which are to continue through Friday, came after South Korea completed its annual 12-day 害羞草研究所淗oguk害羞草研究所� field exercises that officials say also involved an unspecified number of American troops.

North Korea害羞草研究所檚 latest statement came just days after the country into the sea, extending a barrage of launches since late September. Some of those launches have been described by the North as on South Korean and U.S. targets.

North Korea has said its testing activities are meant as a warning amid the joint military drills. But some experts say Pyongyang has also used the drills as a chance to test new weapons systems, boost its nuclear capability and increase its leverage in future dealings with Washington and Seoul.

In comments attributed to an unidentified spokesperson, the North Korean Foreign Ministry statement said the military drills exposed the United States as the 害羞草研究所渃hief culprit in destroying peace and security.害羞草研究所� It said the North was ready to take 害羞草研究所渁ll necessary measures害羞草研究所� to defend against outside military threats.

害羞草研究所淚f the U.S. continuously persists in the grave military provocations, the DPRK will take into account more powerful follow-up measures,害羞草研究所� the spokesperson said, using North Korea害羞草研究所檚 formal name, the Democratic People害羞草研究所檚 Republic of Korea. The statement did not specify what those measures could be.

South Korean officials have said North Korea could up the ante in coming weeks by detonating its first nuclear test device since September 2017, which could possibly take the country a step closer to its goals of building a full-fledged nuclear arsenal capable of threatening regional U.S. allies and the American mainland.

In recent weeks, 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 that firing was in reaction to South Korean live-fire exercises at land border areas. The rival Koreas exchanged warning shots Oct. 24 along their disputed western sea boundary, a scene of past bloodshed and naval battles, as they accused each other of violating the boundary.

Kim Tong-hyung, The Associated Press

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