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For the first time since the 1980s a U.S. nuclear-armed ballistic missile submarine (SSBN) visited South Korea on Tuesday, as the allies launched talks to coordinate their responses in the event of a nuclear war with North Korea, Reuters reported.

White House Indo-Pacific coordinator Kurt Campbell confirmed the rare visit, which had been expected after it was announced in a joint declaration during a summit between South Korean President Yoon Suk Yeol and U.S. President Joe Biden in Washington in April.

"As we speak, an American nuclear submarine is making port in Busan today. That's the first visit of (an) American nuclear submarine in decades," Campbell told reporters at a briefing in Seoul, where he was attending the first Nuclear Consultative Group (NCG) discussion with South Korean officials.

The group, aimed at better coordinating an allied nuclear response in the event of a war with North Korea, was also announced during the April summit amid growing calls in South Korea for its own nuclear weapons, a step Washington opposes.

North Korea, which test fired an intercontinental ballistic missile (ICBM) last week, condemned the NCG on Monday for "openly discussing the use of nukes" and warned against allied plans to increase displays of military force, including the submarine visit.

Campbell did not identify the submarine, but said its visit is a manifestation of American commitment to South Korea's defence.

South Korea's defence ministry later confirmed the submarine's arrival and identified it as the USS Kentucky, an Ohio class SSBN.

U.S. SSBNs rely on stealth to ensure their survival and preserve their ability to launch nuclear missiles during a war, and they rarely make public stops in foreign ports.

The United States has pledged to deploy more strategic assets such as aircraft carriers, submarines and long-range bombers to South Korea to deter North Korea, which has developed increasingly powerful missiles that can hit targets as far away as the United States.