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North Korea’s increasing nuclear threats, along with concerns about China’s ambitions, is pushing the United States to beef up its Asian alliances. In the past year, North Korea has been steadily expanding its nuclear arsenal, as China and Russia repeatedly blocked U.S.-led efforts to toughen sanctions on the North despite its barrage of banned missile tests.

The South Korean-U.S. drills include a computer simulation and several combined field training exercises. South Korean officials said the field exercises would return to the scale of the allies' earlier largest field training that was last held in 2018.

The North’s official Korean Central News Agency said that the launches of two cruise missiles from a submarine off its east coast showed a resolve to respond with “overwhelming powerful” force to the intensifying military maneuvers by "the U.S. imperialists and the South Korean puppet forces.”

KCNA called the missiles “strategic” weapons and said their firings verified the posture of the country’s “nuclear war deterrence.” This implies that North Korea intends to arm the cruise missiles with nuclear warheads, though it’s still unknown if it has overcome the last remaining technological barriers to acquire functioning nuclear-tipped missiles.

It said the missiles flew more than two hours, drawing figure-eight-shaped patterns and demonstrating an ability to hit targets 1,500 kilometers (930 miles) away. The missiles were fired from the 8.24 Yongung ship, KCNA said, referencing a submarine that North Korea used to conduct its first submarine-launched ballistic missile test in 2016.

The reported launch details show Japan, including U.S. military bases in Okinawa, is within striking distance of the cruise missiles if they are fired from the North’s eastern waters, said Kim Dong-yub, a professor at the University of North Korean Studies in Seoul. He added the weapons could reach even the U.S. Pacific territory of Guam if a North Korean submarine can operate farther from its shore.

Sunday's actions were the North’s first underwater missile launches since it test-fired a weapon from a silo under an inland reservoir last October.

North Korea’s command of submarine-launched missile systems would make it harder for adversaries to detect launches in advance and would provide the North with retaliatory attack capability. Experts say it would take years, extensive resources and major technological improvements for the heavily sanctioned nation to build a fleet of several submarines that could travel quietly in seas and reliably execute strikes.

The tests also were the North’s first known launches of cruise missiles from a submarine. Its previous underwater launches all involved ballistic missiles. It’s also the first time for North Korea to fire multiple missiles from a submarine on a single launch event, observers say.

“At a time when its efforts to build (bigger submarines) have reported little progress due to the sanctions, North Korea wants to show it’s still almost developed the types of missiles that can be fired from a submarine,” said Moon Keun-sik, a submarine expert who teaches at Kyonggi University in South Korea.

Moon said the North’s submarine-launched cruise missiles were likely designed to strike approaching U.S. aircraft carriers and big ships or other shorter-range targets on the ground, while the North wants to use submarine-launched ballistic missiles to hit targets in the U.S. mainland.

South Korea’s military said the launches were conducted in waters near the North’s port city of Sinpo, the site of a major submarine-building shipyard. Military spokesperson Lee Sung Jun said South Korean assessments didn’t match the launch details North Korea provided but didn’t elaborate.

Lee said South Korea’s military has been upgrading assets required to deal with North Korean submarine threats. South Korea’s Unification Ministry separately called the launches “very regrettable,” saying North Korea has nothing to gain by raising tensions.

After more than 70 missile tests last year, North Korea has fired several additional rounds this year, including an intercontinental ballistic missile potentially capable of reaching the mainland U.S., and short-range, nuclear-capable missiles designed to hit South Korea.

Experts say Kim, who sees his nuclear arsenal as his best security guarantee, is trying to pressure the United States into accepting the North as a legitimate nuclear power and relax international economic sanctions.

North Korea sees regular South Korea-U.S. military exercises as a major security threat, though the allies say their drills are defensive. Some observers say North Korea uses the drills as a pretext to test weapons and modernize its nuclear arsenal to secure an upper hand in dealings with the United States.

In past years, the U.S. and South Korea cancelled or scaled back drills to pursue diplomatic efforts to denuclearize North Korea and out of concern about the COVID-19 pandemic. The two countries once more expanded exercises as North Korea’s nuclear threats has grown.

In recent weeks, ts.

Last Thursday, on a South Korean airfield. He ordered his military to maintain the capability to “overwhelmingly respond ” to enemy actions, which he said included “all sorts of more frantic war preparation moves,” according to KCNA.

North Korea’s Foreign Ministry on Monday also accused the United States and other Western countries of plotting to call a U.N. Security Council meeting to discuss what it called its “non-existent human rights issue.” It said North Korea will take “the toughest counteraction against the most vicious hostile plots of the U.S. and its followers.”

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Associated Press writer Kim Tong-hyung contributed to this report.

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