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A South Korean news magazine with front cover photos of President Trump and North Korean leader Kim Jong Un and a headline "Korean Peninsula Crisis" is displayed at the Dong-A Ilbo building in Seoul, South Korea, in September. Ahn Young-joon/AP hide caption

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Ahn Young-joon/AP

From front row left, South Korean President Moon Jae-in; his wife, Kim Jung-sook and Ivanka Trump watch the closing ceremony of the 2018 Winter Olympics. Kim Yong Chol, vice chairman of North Korea's ruling Workers' Party Central Committee, stands third from left in the back row. Earlier in the day, the South said the North was open to U.S. talks. Michael Probst/AP hide caption

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Michael Probst/AP

President Trump speaks on the South Lawn of the White House on Friday shortly before he announced new sanctions against North Korea. The measures are designed to prevent shipping companies from evading existing measures by sending prohibited goods to the country. Andrew Harnik/AP hide caption

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Andrew Harnik/AP

Vice President Pence and South Korean President Moon Jae-in at the Gangneung Ice Arena at the 2018 Winter Olympics in Gangneung, South Korea, on Feb. 10. Bernat Armangue/AP hide caption

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Bernat Armangue/AP

A man impersonating Kim Jong Un throws out a thumbs up in front of the North Korean cheerleaders attending an Olympic women's ice hockey game Wednesday. Yelim Lee/AFP/Getty Images hide caption

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Yelim Lee/AFP/Getty Images

North Korea's Ryom Tae Ok (left) and Kim Ju Sik compete in the pair skating short program of the figure skating event during the Pyeongchang 2018 Winter Olympic Games at the Gangneung Ice Arena on Wednesday. Aris Messinis/AFP/Getty Images hide caption

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Aris Messinis/AFP/Getty Images

South Korean President Moon Jae-in, IOC president Thomas Bach, North Korea's nominal head of state Kim Yong Nam and Kim Yo Jong greet players from the combined Koreas team on Saturday in Gangneung. Felipe Dana/AP hide caption

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Felipe Dana/AP

Kim Yong Nam, top left, president of the Presidium of North Korean Parliament, and Kim Yo Jong, sister of North Korean leader Kim Jong Un, top right, sit behind U.S. Vice President Mike Pence, bottom left, and Japanese Prime Minister Shinzo Abe, bottom right, as they watch the opening ceremony of the 2018 Winter Olympics in Pyeongchang, South Korea. Patrick Semansky/AP hide caption

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Patrick Semansky/AP

Sarah Murray, center, head coach of the unified Korean women's ice hockey team, says the team has come together since being formed through a political dialogue. Here, Murray and the South Korean players (in black) welcomed North Korea's coach Pak Chol-Ho and members of the northern team last month. The united team now wears all-white coats. Pool/Getty Images hide caption

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Pool/Getty Images

Vice President Pence is greeted by Japanese Prime Minister Shinzo Abe in Tokyo on Wednesday. Shizuo Kambayashi/AP hide caption

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Shizuo Kambayashi/AP

Pence Starts Asia Trip Amid Signs Of Strain With South Korea

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Vice President Pence addresses a dinner earlier this year in White Sulphur Springs, W.V. Pence is heading to South Korea for diplomatic efforts and Olympic events. Alex Wong/Getty Images hide caption

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Alex Wong/Getty Images

President Trump's State of the Union address is broadcast at a railway station in Seoul, South Korea, on Wednesday. The White House is no longer considering Victor Cha for the South Korea ambassadorship. Lee Jin-man/AP hide caption

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Lee Jin-man/AP