In this photo released by the Taiwan Presidential Office, Taiwan president Tsai Ing-wen, right, greets Francois de Rugy, the head of the Taiwan Friendship group in the National Assembly, the lower house of France's Parliament, during a visit at the Presidential Office in Taipei, Taiwan, December 16, 2021. Rugy is leading a team of French lawmakers from the French National Assembly on a five-day visit to Taiwan. (Photo by Taiwan Presidential Office via AP Photo)





European Commission President Ursula von der Leyen, right, and Ukraine's President Volodymyr Zelenskyy, left, during a group photo of EU leaders and Eastern Partnership countries at an Eastern Partnership Summit in Brussels, Wednesday, December 15, 2021. European Union leaders meet with partner nations on its eastern borders on Wednesday, with the Russian military buildup on Ukraine's border as the main point of focus. (Photo by Olivier Matthys/AP Photo)





Daria Navalnaya, the daughter of jailed Russian opposition leader Alexei Navalny, delivers a speech during the Award of the Sakharov Prize ceremony at the European Parliament in Strasbourg, eastern France, Wednesday, December 15, 2021. Daria Navalnaya receives the Sakharov Prize for Freedom of Thought Award, the European Union top human rights prize, on behalf of her father. (Photo by Julien Warnand, Pool Photo via AP Photo)





Britain's Prince Charles, Prince of Wales, adjusts his face covering during his visit to Lambeth GP Federation Covid Vaccinations Walk-In Centre in central London on December 14, 2021. UK Prime Minister Boris Johnson on Monday said at least one person infected with Omicron had died, as the country began an ambitious booster programme against the variant. (Photo by Hannah McKay/Pool via AFP Photo)





Luna smiles after getting a dose of the Pfizer-BioNTech vaccine against the coronavirus disease (COVID-19) for children at a children doctor's practice in Maintal near Frankfurt, Germany, December 15, 2021. (Photo by Kai Pfaffenbach/Reuters)





A medical worker guides people as they wait for their coronavirus test at a makeshift testing site in Seoul, South Korea, Thursday, December 16, 2021. (Photo by Ahn Young-joon/AP Photo)





Children wait after receiving their first dose of coronavirus disease (COVID-19) vaccine at Infanta Sofia University hospital as Spain begins vaccinating 5-11 year-olds, in San Sebastian de los Reyes, outside Madrid, December 15, 2021. (Photo by Susana Vera/Reuters)





A young girl receives a dose of the Pfizer-BioNTech vaccine against Covid-19 developed for children between 5 and 11 years of age, at the Fejer County Szent Gyorgy Teaching Hospital in Szekesfehervar, Hungary, 15 December 2021, as the vaccination of children begins in the country. (Photo by Tamas Vasvari/EPA/EFE)





An Indonesian health worker gives a dose of COVID-19 vaccine to an elementary school student during a vaccination drive for children between the ages of six to 11, at an SDN 01 elementary school in Depok, West Java, Indonesia, 14 December 2021. The Indonesian government began COVID-19 vaccinations for children between the ages of six and 11. Government data shows about 26.5 million children have been targeted for vaccination, and the country has reported that more than 4.2 million coronavirus infections with cases among children aged 0 to 18, making up 13 percent of total infections in Indonesia. (Photo by Bagus Indahono/EPA/EFE)





A young girl receives a vaccine as children are administered the first shot of the Pfizer COVID-19 vaccine at Hospital de Henares in Coslada, Madrid, Wednesday, December 15, 2022. Starting from Wednesday, Spain is trying to begin a speedy vaccination rollout for around 3.3 million children aged 5-11, the group that is leading contagion rates in the country and largely believed to be spreading new infections to their parents and grandparents. (Photo by Bernat Armangue/AP Photo)





A boy receives a dose of Pfizer-BioNTech COVID-19 vaccination for children aged 5 - 11, in Rome, Wednesday, December 15, 2021. Italy has started vaccinating children aged 5-11 against COVID-19 as the government braces for the spread of the omicron variant during the holiday season. (Photo by Andrew Medichini/AP Photo)





Paul Heinz Suarez Gamarra, known as the Peruvian Santa Claus, arrives to the Villa Panamericana hospital using a ladder basket of the local volunteer firefighter brigade, to give presents to young Covid-19 virus patients, in Lima, on December 14, 2021. (Photo by Ernesto Benavides/AFP Photo)





Acrobats dressed as Super heroes come down from the roofs to make a surprise greeting at the windows of the rooms of the little patients in Pediatrics and of all the patients, at the San Paolo hospital in Milan, Italy, Wednesday, December 15, 2021. (Photo by Luca Bruno/AP Photo)





Acrobats dressed as Super heroes come down from the roofs to make a surprise greeting at the windows of the rooms of the little patients in Pediatrics and of all the patients, at the San Paolo hospital in Milan, Italy, Wednesday, December 15, 2021. (Photo by Luca Bruno/AP Photo)





Glam revellers have proudly shown off their vaccine passports as they glammed up for a night on the town on the first day of fresh Covid restrictions in Newcastle, United Kingdom on December 15, 2021. Brits donning festive gear decided to tear up nightclub dance floors and booze in pubs despite fears over the Omicron variant. (Photo by Newcastle New Projects)





A man dressed as a Christmas elf enjoying a pint outside a pub in the south of the city of London, United Kingdom on December 15, 2021. (Photo by Jill Mead/The Guardian)





The cast of Moulin Rouge, Harry Potter and the Cursed Child and Frozen pose for a photo on December 15, 2021 in Melbourne, Australia. Over 100 cast and crew of three major Broadway blockbusters – Disney's Frozen, Harry Potter and the Cursed Child and Moulin Rouge! The Musical – gathered for the historic photo opportunity to celebrate the return of live theatre in Melbourne. (Photo by Sam Tabone/WireImage)





People walk on a one kilometer long path in the illuminated forest during the first Broye Luminis Light Festival, in Lully, Switzerland, Tuesday, December 14, 2021. From December 10 to 19, 2021, Broye Luminis will highlight the forest through an enchanting and multi-sensory journey in the “Bois de la Faye” (Faye forest), located near the Rose de la Broye restoroute in Estavayer-le-Lac. (Photo by Laurent Gillieron/Keystone via AP Photo)





Showgirl Eva Silverston puts on make-up ahead of the Winter Wonderland Continental Circus Berlin photocall in Newcastle, Britain, December 15 2021. (Photo by Lee Smith/Reuters)





A man walks past large numbers for the upcoming year 2022, as part of Christmas and New Year decorations at Vorobyovy Hills observation point in Moscow, Russia on December 15, 2021. (Photo by Alexander Nemenov/AFP Photo)