U.S. Vice President Mike Pence, left, shakes hands with Hwang Kyo-ahn, South Korea's acting president and prime minister, ahead of a meeting in Seoul, on Monday, April 17, 2017. Pence encouraged China to take action against North Korea while he met with troops a day after Kim Jong Un's regime defied the Trump administration with a ballistic missile test. Photographer: SeongJoon Cho/Bloomberg via Getty Images
