President Donald Trump (R) and North Korea's leader Kim Jong Un (L) sit down for their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018.

President Donald Trump (R) and North Korea's leader Kim Jong Un (L) sit down for their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Saul Loeb | AFP | Getty Images

North Korea's leader Kim Jong Un (L) shakes hands with US President Donald Trump (R) at the start of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Saul Loeb | AFP | Getty Images

Kim and Trump share a handshake in their initial encounter as the historic meeting kicked off at the Capella Hotel on Sentosa island in Singapore.

President Donald Trump (R) meets with North Korea's leader Kim Jong Un (L) at the start of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Saul Loeb | AFP | Getty Images

The two leaders pose for photographs as press congregate at the 5-star hotel to capture the momentous moment.

North Korea's leader Kim Jong Un (L) walks with US President Donald Trump (R) at the start of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Saul Loeb | AFP | Getty Images

Kim and Trump walk along an external passage of the hotel.

President Donald Trump (R) shakes hands with North Korea's leader Kim Jong Un as they meet at the start of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Saul Loeb | AFP | Getty Images

North Korea's young leader looks jovial beside his U.S. counterpart, who is roughly twice his age.

South Koreans watch on a screen reporting on the U.S. President Trump meeting with North Korean leader Kim Jong-un at the Seoul Railway Station on June 12, 2018 in Seoul, South Korea. Getty Images

South Koreans watch on a screen reporting of the meeting at the Seoul Railway Station. South Korea has shared a fractured history with its northern counterpart since the two countries were separated at the end of World War II in 1945. The division led to the Korean War, which ended in an armistice in 1953.

President Donald Trump (R) waves as he and North Korea's leader Kim Jong Un look on from a veranda during their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Saul Loeb | AFP | Getty Images

Trump waves as he and Kim look on from the Capella hotel before continuing their summit.

President Donald Trump (3rd R) shakes hands with North Korea's leader Kim Jong Un (3rd L) as they sit down with their respective delegations for the US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Saul Loeb | AFP | Getty Images

The U.S. president and North Korean leader shake hands again as they sit down with their respective delegations to begin talks.

President Donald Trump shakes hands with North Korean leader Kim Jong Un at the Capella Hotel on Sentosa island in Singapore June 12, 2018. Jonathan Ernst | Reuters

The U.S. and North Korean flags are seen side-by-side for what is widely believed to be the first official time as the two country's respective leaders reach out to share a highly symbolic handshake.

Press watch as television screens display a news broadcast of U.S. President Donald Trump and North Korean leader Kim Jong Un from inside a temporary media center in Singapore on Tuesday, June 12, 2018. Bloomberg | Getty

Members of the press watch and photographic the historic first handshake between Trump and Kim from inside a temporary media center set up in Singapore for the summit.

North Korea's leader Kim Jong Un (R) walks with US President Donald Trump (L) during a break in talks at their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Anthony Wallace | Getty

Trump and Kim walk through the gardens of the Capella hotel during a break in the summit.

US President Donald Trump (2nd R) and North Korea's leader Kim Jong Un (2nd L) sign documents as US Secretary of State Mike Pompeo (R) and the North Korean leader's sister Kim Yo Jong (L) look on at a signing ceremony during their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Saul Loeb | Getty

After a morning of negotiations and a working lunch, Trump and Kim sit down in front of the media and sign what the U.S. president described as a "very comprehensive" deal. Behind, to the left, stands Kim's sister Kim Yo Jong, and, to the right, U.S. Secretary of State Mike Pompeo.

North Korea's leader Kim Jong Un (L) shakes hands with US President Donald Trump (R) after taking part in a signing ceremony at the end of their historic US-North Korea summit, at the Capella Hotel on Sentosa island in Singapore on June 12, 2018. Anthony Wallace | Getty Images