US nuclear-armed submarines to resume visits to South Korea for first time in 30 years

Yoon Suk-yeol meets Joe Biden in Washington amid concerns in South over North's nuclear buildup

The US and South Korea have reaffirmed their alliance, agreeing that nuclear-armed submarines would resume port visits and threatening a swift, overwhelming and decisive response" to any North Korean nuclear attack, including retaliation in kind by the US.

The South Korean president, Yoon Suk Yeol, said that response would include US nuclear weapons, making explicit an element of the alliance that normally remains unspoken.