Kim Yo Jong condemned the leaders of the U.S. and South Korea on Saturday for threatening the “end of the regime” if North Korea uses nuclear weapons, accusing President Joe Biden of “senility.”

In a statement published by state media, the North Korean leader’s powerful sister criticized the Washington Declaration signed by Biden and South Korean President Yoon Suk-yeol on Wednesday as “a typical product of their extreme anti-DPRK hostile policy.”