North Korea's Insults and Biden's Nuclear Response: Tensions Rise in Korean Peninsula.

Kim Yo Jong, the sister of North Korea's leader, has warned that the new US-South Korea agreement would only lead to "more serious danger" and that a nuclear deterrent "should be brought to further perfection." She also lashed out at US President Joe Biden, calling him senile and "too miscalculating and irresponsibly brave." The renewed US expression of support for Seoul includes the promise to have US nuclear submarines make port calls in South Korea, something that has not taken place for over 40 years. The two countries also committed to plans for bilateral presidential consultations in the event of a nuclear attack from North Korea, the establishment of a nuclear consultative group, and improved information exchange.