North Korea has declared its possession of nuclear weapons for self-defense, raising concerns about potential attacks on the U.S. and Japan. Discussions highlight the uncertainty regarding the yield and effectiveness of North Korea's nuclear arsenal, with comparisons made to historical bombings in Hiroshima and Nagasaki. Experts suggest that while a nuclear attack could cause significant destruction, the actual threat level may be lower than perceived, especially given North Korea's limited delivery capabilities. The potential impact of a nuclear strike would be devastating, with casualties and economic damage projected to be in the hundreds of billions. Overall, the conversation emphasizes the need for preparedness and understanding of nuclear threats rather than political blame.