Russian President Vladimir Putin gestures during his annual news conference in Moscow, Russia, Thursday, December 20, 2018. Putin issued a chilling warning Thursday about the rising threat of a nuclear war, saying “it could lead to the destruction of civilization as a whole and maybe even our planet” – and putting the blame squarely on the U.S. (Photo by Alexander Zemlianichenko/AP Photo)





In this Monday, December 17, 2018, file photo, North Koreans wait for their turn to lay flowers at the bronze statues of their late leaders Kim Il Sung and Kim Jong Il at Mansu Hill Grand Monument in Pyongyang, North Korea. North Koreans marked the seventh anniversary of the death of leader Kim Jong Il with visits to statues and vows of loyalty to his son and successor, Kim Jong Un. (Photo by Dita Alangkara/AP Photo)





Ivan Arostica, president of the Constitutional Court, is escorted by riot policemen as demonstrators protest against an appeal from government coalition Chile Vamos to nullify a draft law that further restricts human rights abusers from getting prison benefits, according to local media, in Santiago, Chile December 19, 2018. (Photo by Ivan Alvarado/Reuters)





Ivan Arostica, president of Chile's Constitutional Court, ties to avoid a kick by a protester as he leaves the court, which listened to arguments in favor and against conditional freedom for those convicted of human rights crimes, in Santiago, Chile, on Wednesday, December 19, 2018. Protesters fear a ruling in favor could benefit the prisoners of Punta Peuco, a prison for state agents convicted of murder during the 1973-1990 dictatorship of Augustus Pinochet. (Photo by Esteban Felix/AP Photo)





Chilean dockworkers clash with riot police during a protest against the port operator TPS (South Pacific Terminal) demanding the inclusion of temporary workers in the collective bargaining, in Valparaiso, Chile December 19, 2018. (Photo by Rodrigo Garrido/Reuters)





Taxi drivers take part in a protest against a carpool service application launched by Kakao Corp in Seoul, South Korea, December 20, 2018. (Photo by Kim Hong-Ji/Reuters)





Fiston Adumba, 32, an opposition supporter, reacts to Corneille Nangaa announcing the postponement of the elections, in Kinshasa, Democratic Republic of the Congo, Thursday December 20, 2018. Congo's electoral commission has delayed the country's long-awaited presidential election until Dec. 30, citing problems caused by a recent fire that destroyed 80 percent of the voting machines in the capital. (Photo by Jerome Delay/AP Photo)





A Honduran migrant pleads with a U.S. Border Patrol agent to let him cross into the U.S., as he peeks through a barrier in Tijuana, Mexico, on Saturday, December 15, 2018. The officer did not respond, and the Honduran did not know the agent would not prevent him from crossing. The man returned to the group of people he was with. (Photo by Moises Castillo/AP Photo)





Supporters of opposition leader Martin Fayulu sing and dance as they march and chant slogans in the streets of the Ndjili district of Kinshasa on December 19, 2018, ahead of a campaign rally for Democratic Republic of Congo's general elections. Democratic Republic of Congo goes to the polls on December 23, 2018 in elections which could see the country emerge from 17 years of conflict-ridden rule under the incumbent controversial president. (Photo by Luis Tato/AFP Photo)





Firefighters stand opposite members of the regional Catalan police force Mossos d'Esquadra during a protest calling for more personnel and resources in Barcelona on December 20, 2018. (Photo by Josep Lago/AFP Photo)





Catalan firefighters hold a demonstration, marching from Urquinaona square to the regional Parliament building, complaining about the lack of officers and equipment on December 20, 2018 in Barcelona, Spain. (Photo by David Zorrakino/Europa Press via Getty Images)





Passengers queue while waiting for announcements at Gatwick South Terminal on December 20, 2018 in London, England. Authorities at Gatwick closed the runway after Drones were spotted over the airport on the night of December 19. The shutdown has sparked a succession of delays and diversions in the run up to the Christmas getaway, in what authorities have called a “deliberate act” to disrupt the airport. (Photo by Dan Kitwood/Getty Images)





Search and rescue team approaches the Soyuz MS-09 capsule, carrying the International Space Station (ISS) crew members Serena Aunon-Chancellor of the U.S., Alexander Gerst of Germany and Sergey Prokopyev of Russia, shortly after its landing in a remote area near the town of Zhezkazgan, formerly known as Dzhezkazgan, Kazakhstan December 20, 2018. (Photo by Shamil Zhumatov/Reuters)





This handout photo released by NASA shows the parachute of the Soyuz MS-09 spacecraft shortly after the capsule landed with Expedition 57 crew members in a remote area outside the town of Dzhezkazgan (Zhezkazgan), Kazakhstan, on December 20, 2018. Three astronauts landed back on Earth on December 20, 2018 after a troubled stint on the ISS marred by an air leak and the failure of a rocket set to bring new crew members. (Photo by Bill Ingalls/NASA via AFP Photo)





Russian cosmonaut Sergey Prokopyev of Roscosmos and German astronaut Alexander Gerst of the European Space Agency dressed in Kazakh national costumes attend a press conference at the airport of Dzhezkazgan (Zhezkazgan), Kazakhstan, on December 20, 2018. Three astronauts landed back on Earth on December 20, 2018 after a troubled stint on the ISS marred by an air leak and the failure of a rocket set to bring new crew members. (Photo by Shamil Zhumatov/AFP Photo)





This photograph, obtained courtesy of the Obama Foundation, shows former US President Barack Obama delivering gifts, greeting patients and their parents at Children’s National Medical Center in Washington, DC, December 19, 2018. (Photo by Chuck Kennedy/AFP Photo)





Francis, 56, from southwest Scotland with his Staffordshire Bull Terrier, Milo, sits on Oxford Street in London, Britain, 20 December 2018. Francis has been on the streets of London for eight years after losing his son and breaking up with his partner. “sh*t happens in life” Francis says. “I'll be right here for Christmas”. London now accounts for a quarter of Britain's homeless. Some twenty five thousand people across the UK are facing Christmas on the street. (Photo by Andy Rain/EPA/EFE)





Supporters try to get a glimpse of Philippines' Miss Universe 2018 Catriona Gray as she visits an orphanage in metropolitan Manila, Philippines on Thursday, December 20, 2018. Gray is in the country for a short visit to attend to a charity event at an orphanage before flying to the US. (Photo by Aaron Favila/AP Photo)





Lamplighter Jan Tater lights a historic gas lamp on Charles Bridge in Prague, Czech Republic, 18 December 2018. Every day at dusk since the end of November and during Advent, Jan Tater and his colleague light 37 historic gas lamps on the medieval Charles Bridge as an attraction for tourists. The first gas lamps on the Charles Bridge were installed in 1848. (Photo by Martin Divisek/EPA/EFE)





Partygoers in Cardiff, England refused to let the rain dampen their Christmas spirits on “Thirsty Thursday”, December 19, 2018. Christmas partygoers got into the party spirit last night as they headed out for some festive fun up and down the country. (Photo by Huw Evans Picture Agency)