The sister of North Korean dictator Kim Jong-un has lashed out at Joe Biden, calling him an "old man with no future".
The US President was criticised by Kim Yo-Jong as tensions rise between the two giant states, with a deal announced on South Korean leader Yoon Suk Yeol’s state visit to shield the country from potential nuclear threats.
President Yoon's Washington visit saw the agreement for the US to intervene in any threat of attack, with Biden agreeing to deploy nuclear weapons to prevent Kim Jong-un attacking the state.
But the announcement - named the Washington Declaration - was met with fury from the North Korean dictator's sister, who acts as one of her brother's top foreign policy officials, dubbing the move a "hostile and aggressive will of action" while calling Biden "irresponsibly brave".
Yo-Jong's comments were the country's first in light of the agreement struck earlier this week, as she said the deterrant needed bringing "to further perfection".
The Korean Central News Agency quoted Yo-Jong as saying: "South Korean President Yoon Suk Yeol’s recent visit to Washington was an occasion for us to have much clearer understanding about the root cause and physical entity disturbing peace and security of the Korean Peninsula and the region."
"The more the enemies are dead set on staging nuclear war exercises, and the more nuclear assets they deploy in the vicinity of the Korean peninsula, the stronger the exercise of our right to self-defence will become."
It comes days after President Biden announced his candidacy for the 2024 election, with his Washington Declaration vowing to dock nuclear missile's on the South's banks in return for the country not escalating its own arsenal.
Kim Yo-Jong added: "We cannot let pass nor overlook is the fact that the chief executive of the enemy state officially and personally used the word 'the end of regime' under the eyes of the world,’ she said.
"Would we simply regard it as the man’s senility?"
During a White House conference on Wednesday afternoon, Biden said: "Our mutual defence treaty is ironclad, and that includes our commitment to extended deterrence, and - and that includes the nuclear threat and - the nuclear deterrent.
"They are particularly important in the face of the DPRK’s increased threats and the blatant violation of [UN] sanctions."
He added: "At the same time, we continue to seek serious and substantial diplomatic breakthroughs with the DPRK to bolster stability on the Peninsula, reduce the threat of proliferation, and address our humanitarian and human rights concerns for the people of [North Korea].
"The Republic of Korea and the United States are working together, including through our trilateral cooperation with Japan, to ensure the future of the Indo-Pacific is free, is open, prosperous, and secure."
