People watch a TV screen showing North Korean leader Kim Jong Un and U.S. President Donald Trump, left, at the Seoul Railway Station in Seoul, South Korea, Friday, March 9, 2018. After months of trading insults and threats of nuclear annihilation, Trump agreed to meet with Kim by the end of May to negotiate an end to Pyongyang's nuclear weapons program, South Korean and U.S. officials said Thursday. No sitting American president has ever met with a North Korea leader. The signs read: " Kim Jong Un understands that the routine joint military exercises between the South Korean and the United States must continue." (AP Photo/Ahn Young-joon)