Biden departs after full show of alliance Two leaders agree to step up deterrence against North Korea By Shin Ji-hye Published : May 22, 2022 - 15:57 Updated : May 22, 2022 - 20:53 US President Joe Biden concluded his trip to South Korea after visiting a joint airspace control center on Sunday before leaving for Japan. During his three-day stay here, the two leaders reaffirmed their commitment t..