Members of North Korean media take images as motorcade of North Korea's leader Kim Jong Un rides past Opera House, after the second U.S.-North Korea summit in Hanoi, Vietnam, February 28, 2019. REUTERS/Kham 

A Vietnamese traffic policewoman keeps watch before the motorcade transporting U.S. President Donald Trump passes, after leaving the Metropole Hotel after his meeting with North Korean leader Kim Jong Un for the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

Motorcade of North Korea's leader Kim Jong Un rides past Opera House, as he leaves after the second U.S.-North Korea summit in Hanoi, Vietnam, February 28, 2019. REUTERS/Kham 

Bodyguards of North Korean leader Kim Jong Un are seen as his motorcade leaves the Metropole after the North Korea-U.S. summit in Hanoi, Vietnam, February 28, 2019. REUTERS/Kim Kyung-Hoon 

People wait for the motorcade transporting U.S. President Donald Trump to pass, after leaving the Metropole Hotel after his meeting with North Korean leader Kim Jong Un for the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

The motorcade of North Korean leader Kim Jong Un is seen after leaving the Metropole, following the North Korea-U.S. summit in Hanoi, Vietnam, February 28, 2019. REUTERS/Kim Kyung-Hoon 

The motorcade transporting North Korean leader Kim Jong Un passes the Opera House after leaving the Metropole Hotel after his meeting with U.S. President Donald Trump for the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Athit Perawongmetha 

The motorcade transporting North Korean leader Kim Jong Un passes the Opera House after leaving the Metropole Hotel after his meeting with U.S. President Donald Trump for the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Athit Perawongmetha 

Bystanders take photos of North Korean leader Kim Jong Un's motorcade as it leaves the Metropole after the North Korea-U.S. summit in Hanoi, Vietnam, February 28, 2019. REUTERS/Kim Kyung-Hoon 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis TPX IMAGES OF THE DAY 

North Korea's leader Kim Jong Un and U.S. President Donald Trump talk in the garden of the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis TPX IMAGES OF THE DAY 

North Korea's leader Kim Jong Un listens as U.S. President Donald Trump speaks during the extended bilateral meeting in the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump walk at the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump interact during the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un sits alongside Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, and North Korean Foreign Minister Ri Yong Ho at the extended bilateral meeting with U.S. President Donald Trump (not pictured) in the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump look on during the extended bilateral meeting in the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel alongside acting White House Chief of Staff Mick Mulvaney and North Korean Foreign Minister Ri Yong Ho during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un speaks as U.S. President Donald Trump looks on during the extended bilateral meeting in the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, attend the extended bilateral meeting in the Metropole hotel with U.S. President Donald Trump and his delegation during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump speaks during the extended bilateral meeting with North Korea's leader Kim Jong Un in the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump, U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton and acting White House Chief of Staff Mick Mulvaney attend the extended bilateral meeting in the Metropole hotel with North Korea's leader Kim Jong Un and his delegation during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump look on at the extended bilateral meeting in the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump speak at the extended bilateral meeting in the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

White House national security adviser John Bolton reacts beside U.S. President Donald Trump and Secretary of State Mike Pompeo at the extended bilateral meeting in the Metropole hotel with North Korea's leader Kim Jong Un (not pictured) during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump and North Korea's leader Kim Jong Un look on while White House national security adviser John Bolton reacts during the extended bilateral meeting in the Metropole hotel alongside U.S. Secretary of State Mike Pompeo, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump reacts beside North Korea's leader Kim Jong Un during the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un speaks with U.S. President Donald Trump at the extended bilateral meeting in the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump looks on at the extended bilateral meeting in the Metropole hotel with North Korea's leader Kim Jong Un during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un attends the extended bilateral meeting in the Metropole hotel with U.S. President Donald Trump (not pictured) during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump looks on during the extended bilateral meeting with North Korea's leader Kim Jong Un in the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump attend the extended bilateral meeting in the Metropole hotel with U.S. Secretary of State Mike Pompeo, White House national security adviser John Bolton, acting White House Chief of Staff Mick Mulvaney, North Korean Foreign Minister Ri Yong Ho and Kim Yong Chol, Vice Chairman of the North Korean Workers' Party Committee, during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

North Korea's leader Kim Jong Un and U.S. President Donald Trump talk in the garden of the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis TPX IMAGES OF THE DAY 

North Korea's leader Kim Jong Un and U.S. President Donald Trump talk in the garden of the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump and North Korea's leader Kim Jong Un walk in the garden at the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump and North Korea's leader Kim Jong Un walk in the garden at the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump and North Korea's leader Kim Jong Un walk in the garden at the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump and North Korea's leader Kim Jong Un walk in the garden at the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

U.S. President Donald Trump and North Korea's leader Kim Jong Un walk in the garden at the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

An employees of a foreign exchange trading company works next to monitors displaying Japanese yen's exchange rate against the U.S. dollar and broadcasting a meeting between U.S. President Donald Trump and North Korean leader Kim Jong Un during their second North Korea-U.S. summit in Hanoi, in Tokyo, Japan February 28, 2019. REUTERS/Issei Kato 

An employees of a foreign exchange trading company works next to monitors displaying Japanese yen's exchange rate against the U.S. dollar, Euro and broadcasting a meeting between U.S. President Donald Trump and North Korean leader Kim Jong Un during their second North Korea-U.S. summit in Hanoi, in Tokyo, Japan February 28, 2019. REUTERS/Issei Kato 

An employees of a foreign exchange trading company works next to monitors displaying Japanese yen's exchange rate against the U.S. dollar and broadcasting a meeting between U.S. President Donald Trump and North Korean leader Kim Jong Un during their second North Korea-U.S. summit in Hanoi, in Tokyo, Japan February 28, 2019. REUTERS/Issei Kato 

Employees of a foreign exchange trading company work next to monitors displaying Japan's Nikkei stock average and the Japanese yen's exchange rate against the U.S. dollar as a television screen broadcasting a meeting between U.S. President Donald Trump and North Korean leader Kim Jong Un during their second North Korea-U.S. summit in Hanoi, in Tokyo, Japan February 28, 2019. REUTERS/Issei Kato 

A television monitors broadcasting a meeting between U.S. President Donald Trump and North Korean leader Kim Jong Un during their second North Korea-U.S. summit in Hanoi, is seen through Japan and the U.S. national flags at a foreign exchange trading company in Tokyo, Japan February 28, 2019. REUTERS/Issei Kato 

Employees of a foreign exchange trading company work next to monitors displaying Japan's Nikkei stock average and the Japanese yen's exchange rate against the U.S. dollar as a television screen broadcasting a meeting between U.S. President Donald Trump and North Korean leader Kim Jong Un during their second North Korea-U.S. summit in Hanoi, in Tokyo, Japan February 28, 2019. REUTERS/Issei Kato 

U.S. President Donald Trump and North Korea's leader Kim Jong Un walk in the garden at the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

Kim Yo Jong, sister of North Korea's leader Kim Jong Un and first vice department director of the ruling Workers’ Party’s Central Committee, looks on in the garden of the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis 

A security personnel stands guard outside the Metropole Hotel during the second U.S.-North Korea summit in Hanoi, Vietnam February 28, 2019. REUTERS/Kham 

Policemen stand next to the media outside the Metropole Hotel during the second U.S.- North Korea summit in Hanoi, Vietnam February 28, 2019. REUTERS/Kham 

A soldier stands near a military armoured vehicle outside the Metropole Hotel during the second US- North Korea summit in Hanoi, Vietnam February 28, 2019. REUTERS/Kham 

A Vietnamese veteran hold U.S. and North Korean flags while he stands guard near the Metropole Hotel during the second U.S.- North Korea summit in Hanoi, Vietnam February 28, 2019. REUTERS/Kham 

Policemen guard outside the Metropole Hotel during the second U.S.- North Korea summit in Hanoi, Vietnam February 28, 2019. REUTERS/Kham 

U.S. President Donald Trump and North Korea's leader Kim Jong Un walk in the garden at the Metropole hotel during the second North Korea-U.S. summit in Hanoi, Vietnam February 28, 2019. REUTERS/Leah Millis