Biden and Yoon to strengthen US-South Korea alliance against nuclear threats.

President Joe Biden will announce new nuclear deterrence efforts and a cyber security initiative during South Korean President Yoon Suk Yeol's state visit to the U.S. The move is aimed at deterring a North Korean attack on South Korea, as Pyongyang has stepped up ballistic missile tests. Biden hopes to emphasize the U.S.'s commitment to deterring nuclear action by North Korea and highlight the importance of South Korea and Japan building on their security ties. The U.S., South Korea, and Japan conducted a joint missile defense exercise last week aimed at countering North Korea's growing nuclear arsenal.