North Korea launched multiple ballistic missiles into the sea on Sunday, hours before South Korean President Lee Jae Myung began a state visit to China. South Korea and Japan condemned the launches, viewing them as a threat to regional security and a message to China regarding its ties with Seoul. Experts suggest North Korea is showcasing military achievements ahead of an upcoming party congress and signaling its stance on denuclearization and potential talks with the US. President Lee's visit to Beijing aims to discuss peace on the Korean Peninsula and strengthen bilateral cooperation.