Biden extends 'Hello' to Kim Jong Un amid nuclear tensions

While visiting South Korea, US President Joe Biden said Washington and its allies were "prepared for anything," including Pyongyang restarting nuclear testing.

The leaders of the US and South Korea are "prepared for anything North Korea does," US President Joe Biden said on Sunday, amid rumors that North Korea could test another nuclear weapon after a five-year break.

"We've talked through how we'd respond to whatever they do so I am not concerned, if that's what you're suggesting," Biden told a reporter at a joint press conference with South Korea's newly-elected President Yoon Suk Yeol.

The discussion also included starting "joint drills to prepare for a nuclear attack," Yoon said.

Message for Kim Jong Un is 'Hello'

On the second day of Biden's visit to South Korea, the US president also visited Osan Air Base where US and South Korean troops are monitoring potential threats from Pyongyang.

When asked by a reporter if he had a message for the North Korean dictator Kim Jong Un, Biden said his message was "Hello. Period."