Seoul and Washington are discussing joint planning and exercises involving US nuclear assets to counter growing threats from the North, South Korea's presidential office said Tuesday, after US President Joe Biden said there would be no such joint drills.

The statement was released after Biden said the United States was not discussing joint nuclear exercises with South Korea, seemingly contradicting comments by Seoul's President Yoon Suk-yeol earlier this week.

The two security allies are "in talks over information-sharing, joint planning and the joint implementation plans that follow with regard to the operation of US nuclear assets to respond to North Korea's nuclear weapons", Yoon's office said in a statement.

In an interview with the Chosun Ilbo newspaper published Monday, Yoon said the United States' existing "nuclear umbrella" and "extended deterrence" were no longer enough to reassure South Koreans.

"The nuclear weapons belong to the United States, but the planning, information sharing, exercises and training must be done jointly by South Korea and the United States," Yoon said, adding that the US was "quite positive" about the idea.

Hours after that interview was published, Biden gave an emphatic "no" in response to a question on whether the two sides were considering joint nuclear exercises.

Yoon's office acknowledged Biden's response but said the US president had been "left with no options but to answer 'No' when directly asked... without any context".

"Joint nuclear exercise is a term only used by nuclear powers," said Kim Eun-hye, a spokeswoman for the South Korean president's office.

The back and forth comes after the North's leader Kim Jong Un called for an "exponential" increase in his country's nuclear arsenal and new intercontinental ballistic missiles (ICBMs) to counter what it termed US and South Korean hostility.

In 2022, the North conducted sanctions-defying weapons tests nearly every month, including firing its most advanced ICBM ever.

Under the hawkish Yoon, South Korea has beefed up joint military drills with the United States, which had been scaled back during the pandemic or paused for a bout of ill-fated diplomacy with the North under his predecessor.

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Kim calls for 'exponential increase' of N. Korea's nuclear arsenal
Seoul (AFP) Jan 1, 2023
Kim Jong Un has called for an "exponential" increase in North Korea's nuclear arsenal, including mass producing tactical nuclear weapons and developing new missiles for nuclear counterstrikes, state media said Sunday. In a report at the end of a key party meeting in Pyongyang, Kim said the country must "overwhelmingly beef up the military muscle" in 2023 in response to what it called US and South Korean hostility, the official KCNA reported. Claiming that Washington and Seoul were set on "isolat ... read more