North Korean leader Kim Jong Un attends a wreath laying ceremony at Ho Chi Minh Mausoleum in Hanoi, Vietnam March 2, 2019. (Photo by Jorge Silva/Pool Photo via AP Photo)





North Korean leader Kim Jong Un waves at the Dong Dang railway station in Dong Dang, Vietnam, Saturday, March 2, 2019. Kim boards train for the return trip to North Korea, ending a visit to Vietnam that saw summit breakdown with Trump. (Photo by Minh Hoang/AP Photo)





Protesters clash with police in the streets of Algiers, Algeria, during a demonstration denouncing President Abdelaziz Bouteflika's bid for a fifth term, Friday, March 1, 2019. Tens of thousands of protesters marched through Algeria's capital Friday against ailing President Abdelaziz Bouteflika's bid for a fifth term, surging past a barricade and defying repeated volleys of tear gas fired by police during the tense demonstration. (Photo by Toufik Doudou/AP Photo)





An Indian paramilitary trooper stands guard in Srinagar on March 1, 2019. While Pakistan's promised release of an Indian pilot has eased the threat of a wider conflict, there has been no letup in tension in the Himalayan region divided between the neighbours since 1947. (Photo by Tauseef Mustafa/AFP Photo)





South Korean performers participate in a re-enactment of the historic March First Independence Movement against Japanese during the 100th Independence Movement Day ceremony on March 01, 2019 in Seoul, South Korea. South Koreans celebrate the public holiday marking the 1919 civilian uprising against Japanese rule, which colonized the Korean peninsula from 1910-1945. (Photo by Chung Sung-Jun/Getty Images)





Performers take part in a re-enactment of the historic March First Independence Movement against Japanese colonial rule, in central Seoul, South Korea, March 1, 2019. (Photo by Kim Hong-Ji/Reuters)





A girl waits to be screened by U.S.-backed Syrian Democratic Forces (SDF) after being evacuated out of the last territory held by Islamic State militants, in the desert outside Baghouz, Syria, Friday, March 1, 2019. (Photo by Felipe Dana/AP Photo)





A volunteer lifeguard participates in a mock rescue during the 54th annual “Paso del Hombre” aquatic endurance challenge organized by the Salvadorean Red Cross, in La Libertad, El Salvador on February 24, 2019. The traditional swimming event is the culmination of months of hard water safety training aiming to prepare lifeguards for the holiday season. (Photo by Marvin Recinos/AFP Photo)





In this image released by NASA, a Falcon 9 SpaceX rocket, ready for launch, sits on pad 39A at the Kennedy Space Center in Cape Canaveral, Fla., Friday, March 1, 2019. The spacecraft's unmanned test flight with the Dragon capsule is scheduled for launch early Saturday morning. (Photo by Joel Kowsky/NASA via AP Photo)





A SpaceX Falcon 9 rocket, carrying the Crew Dragon spacecraft, lifts off on an uncrewed test flight to the International Space Station from the Kennedy Space Center in Cape Canaveral, Florida, U.S., March 2, 2019. (Photo by Mike Blake/Reuters)





Schoolgirls look at “The Morning of the Streltsy Execution” by Russian painter Vasily Surikov exhibited at The State Tretyakov Gallery in Moscow on February 26, 2019. (Photo by Mladen Antonov/AFP Photo)





Florist Hans Zijlstra of the Netherlands competes in the FTD World Cup floral design competition during a preview of the “Flower Power” themed Philadelphia Flower Show at the at the Pennsylvania Convention Center in Philadelphia, Friday, March 1, 2019. (Photo by Matt Rourke/AP Photo)





Carnival King Momo Wilson Neto, center holds the key to the city at a ceremony marking the official start of Carnival at the Sambadrome, in Rio de Janeiro, Brazil, Friday, March 1, 2019. Marcelo Crivella, mayor of Rio de Janeiro, opted not to attend the ceremony, and in his place Rio's Tourism President Marcelo Alves handed over the key. (Photo by Silvia Izquierdo/AP Photo)





A reveler performs during the Carmelitas street party in Rio de Janeiro, Brazil, Friday, March 1, 2019. Much of the appeal of Rio street parties is the variety of themes and that people can dress up in costumes or not. (Photo by Leo Correa/AP Photo)





A reveler in a costume poses for the picture during the Carmelitas street party in Rio de Janeiro, Brazil, Friday, March 1, 2019. Much of the appeal of Rio street parties is the variety of themes and that people can dress up in costumes or not. (Photo by Leo Correa/AP Photo)





A reveler wearing a Deadpool costume carries a woman in a Super Woman costume as they enjoy the Carmelitas street party in Rio de Janeiro, Brazil, Friday, March 1, 2019. Much of the appeal of Rio street parties is the variety of themes and that people can dress up in costumes or not. (Photo by Leo Correa/AP Photo)





A reveler dances during the Carmelitas street party in Rio de Janeiro, Brazil, Friday, March 1, 2019. Much of the appeal of Rio street parties is the variety of themes and that people can dress up in costumes or not. (Photo by Leo Correa/AP Photo)





A reveler dances during the “Ceu na Terra” or Heaven on Earth street party in Rio de Janeiro, Brazil, Saturday, February 23, 2019. Merrymakers take to the streets in hundreds of open-air “bloco” parties ahead of Rio's over-the-top Carnival, the highlight of the year for many. (Photo by Leo Correa/AP Photo)