President Joe Biden has made a move to strengthen the American nuclear umbrella protecting South Korea against threats from North Korea.

According to The New York Times, Biden promised that any nuclear attack by North Korea would "end" the government in Pyongyang, highlighting a broad shift from diplomacy to deterrence in response to the threat from the dictatorship.

Biden welcomed South Korea's President Yoon Suk Yeol to the White House on Wednesday for a state visit. During their meeting, the U.S. president promised to give Seoul a voice for the first time in strategic planning on using nuclear weapons in the event of a conflict with North Korea.

In exchange, South Korea renounced its pursuit of a nuclear weapon, a position that Yoon had momentarily seemed to embrace early this year.

Biden also said the United States will deploy nuclear ballistic missile submarines to South Korea for the first time in decades.

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South Korea Yoon Suk Yeol and Joe Biden Agree to Respond to Any North Korean Nuclear Attack

Yoon Suk Yeol and Joe Biden agreed that their countries would retaliate strongly to any nuclear assault from North Korea using all available assets of the alliance, including U.S. nuclear weapons, according to The Korea Times.

A new Nuclear Consultative Group (NCG) was established after the two leaders agreed to hold urgent bilateral presidential meetings in the event of a nuclear assault.

"Our two countries have agreed to hold immediate bilateral presidential consultations in the event of a North Korea nuclear attack and promised to respond swiftly, overwhelmingly, and decisively using the full force of the alliance, including the United States' nuclear weapons," Yoon said during a joint press conference in the Rose Garden.

As a result of the summit, the leaders announced the agreement, called the Washington Declaration, which contained a new bilateral nuclear consultation mechanism and a detailed blueprint of how the United States will deter North Korea's nuclear ambitions.

The agreement affirmed the two leaders' strong, shared commitment to the defense of the people and territories of the United States and the Republic of Korea, including through deepening extended deterrence.

Biden has vowed to use nuclear weapons should North Korea launch any kind of nuke attack against South Korea or other U.S. allies. 

"Look, a nuclear attack by North Korea against the United States, its allies, or partisans... partners, is unacceptable and will result in the end of whatever regime were to take such an action," Biden noted.

While the two countries agreed on a stronger military alliance, Biden and Yoon said the strategic partnership between South Korea and the U.S. will continue to deepen in the economic field, too.

North Korea Declares its Nuclear Status' Irreversible'

North Korea has been testing and training with various powerful new weapons in the past months, including tactical nuclear warheads that could be used on the Korean peninsula and against Japan and advanced intercontinental ballistic missiles that are believed will be able to deliver nuclear bombs anywhere in the United States.

North Korea has recently passed a new law stating its nuclear status is "irreversible," The Japan Times reported.

Despite being a standard tactic for the North, recent developments in its nuclear program and rising concerns about the U.S. defense commitment to the South have left Washington scrambling for options to stop Seoul from inching closer to a nuclear capability.

Some believe that if South Korea were permitted to go nuclear, as it tried in the 1970s, it would set off a chain reaction that would lead other countries, such as inactive nuclear power Japan, to build their own arsenals, ending the global nuclear nonproliferation regime.

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Written by: Bert Hoover

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