A Ukrainian female soldier take a rest near a fighting position on the line of separation from pro-Russian rebels near Debaltsevo, Donetsk region, Ukraine, Ukraine Friday, December 3, 2021. In this Friday, the Ukrainian defense minister warned that Russia could invade his country next month. Russia-West tensions escalated recently with Ukraine and its Western backers becoming increasingly concerned that a Russian troop buildup near the Ukrainian border could signal Moscow's intention to invade. (Photo by Andriy Dubchak/AP Photo)
Migrants from Central America sit on freight cars and railroads as they wait for the departure of a freight train to continue their journey towards Mexico City, in Tierra Blanca, Veracruz, Mexico on December 2, 2021. (Photo by Yahir Ceballos/Reuters)
Army soldiers carry a coffin containing the remains of a passenger killed in a bus crash in Bulgaria ten days ago, during the repatriation ceremony at Skopje Airport, North Macedonia, Friday, December 3, 2021. Two Bulgarian military planes have landed Friday at North Macedonia's main airport carrying remains of 45 people killed in bus crash in Bulgaria ten days ago to be handed to their families for burials. (Photo by Boris Grdanoski/AP Photo)
Patient Pelageya Poyarkova, 101, second from right, speaks with media as she leaves the recovery ward for COVID-19 patients at the Federal Center for Brain and Neurotechnology in Moscow, Russia, Friday, December 3, 2021. Russia has reported more than 9.7 million confirmed cases of COVID-19 in the pandemic and more than 270 thousands deaths, which experts believe could be undercounts. (Photo by Pavel Golovkin/AP Photo)
An Orange Farm, South Africa, resident receives her jab against COVID-19 Friday December 3, 2021 at the Orange Farm multipurpose center. South Africa has accelerated its vaccination campaign a week after the discovery of the omicron variant of the coronavirus. (Photo by Jerome Delay/AP Photo)
A medical worker wearing protective gear in a booth, takes sample from a man at a temporary screening clinic for the coronavirus in Seoul, South Korea, Saturday, December 4, 2021. South Korea again broke its daily records for coronavirus infections and deaths and confirmed three more cases of the new omicron variant as officials scramble to tighten social distancing and border controls. (Photo by Park Mi-so/Newsis via AP Photo)
A man sits outside a cafe in central Auckland, New Zealand, Friday, December 3, 2021. Bars, restaurants and gyms reopened in Auckland on Friday as the last major parts of a lockdown that lasted more than 100 days ended. New Zealand has begun a new phase in its virus response in which there won't be lockdowns but people will be required to show vaccine passes for many services. (Photo by Alex Burton/NZ Herald via AP Photo)
Kyna Bigornia receives her Pfizer COVID-19 booster injection at a vaccination site in Liberty Shopping Centre, Romford, east London on Thursday, December 2, 2021, as the Government accelerates the Covid booster programme to help slow down the spread of the new Omicron variant. (Photo by Yui Mok/PA Images via Getty Images)
Members of the public wear face masks as they go about their daily lives in Liverpool, Sydney, Australia, 02 December 2021. NSW Health authorities have now confirmed six cases of the Omicron variant in the state. (Photo by Bianca De Marchi/EPA/EFE)
A patient has oxygen levels in the blood measured using a pulse oximeter before receiving a dose of vaccine against COVID-19 during a home vaccination visit in Kazan, Tatarstan, Russia on December 2, 2021. Since the start of the pandemic, Tatarstan (including Kazan) has confirmed more than 2,051,000 cases of COVID-19. (Photo by Yegor Aleyev/TASS)
A security worker and a sign to remind travellers to wear a face mask at Amsterdam Schiphol airport on December 2, 2021 in Amsterdam, Netherlands. The Netherlands and other nations worldwide temporarily banned most travellers from South Africa after a new variant of Covid-19 named Omicron was discovered. Omicron has sparked worries around the world that it could resist vaccinations and prolong the nearly two-year Covid-19 pandemic. (Photo by Pierre Crom/Getty Images)
A Pfizer COVID-19 vaccine is prepared at St Charles' Centre for Health and Wellbeing in London, Friday, December 3, 2021. Britain says it will offer all adults a booster dose of vaccine within two months to bolster the nation's immunity as the new omicron variant of the coronavirus spreads. New measures to combat variant came into force in England on Tuesday, with face coverings again compulsory in shops and on public transport. (Photo by Kirsty Wigglesworth/AP Photo)
Medics get prepared to care for COVID-19 patients in the COVID-19 hospital unit at the Etterbeek-Ixelles site of the Iris Sud Hospitals in Brussels, Belgium, 03 December 2021. As the health situation is deteriorating, a new consultation committee is scheduled for 03 December, to define new rules to prevent the spread of the virus. (Photo by Stephanie Lecocq/EPA/EFE)
Jehna Kottori, 10, of Worcester, Mass., prepares to receive a shot of the Pfizer COVID-19 vaccine, Thursday, December 2, 2021, at a mobile vaccination clinic in Worcester. As the U.S. recorded its first confirmed case of the omicron variant, doctors across the country are experiencing a more imminent crisis with a delta variant that is sending record numbers of people to the hospital in New England and the Midwest. (Photo by Steven Senne/AP Photo)
Children work in a classroom while a schoolgirl at home, is connected with a “Buddy” tele-education robot at Jules Ferry elementary school on December 3, 2021 in Ormesson-sur-Marne, near Paris. (Photo by Ludovic Marin/AFP Photo)
A member of the clergy takes a photo ahead of Pope Francis' arrival at the GSP Stadium, in Nicosia, Cyprus, December 3, 2021. Francis is on a five-day trip to Cyprus and Greece by drawing attention once again to his call for Europe to welcome migrants. (Photo by Amir Cohen/Reuters)
Pianist Eleanora Costantini, a 25-year-old pianist from Venice, plays a composition on the Flying Piano at the Opportunity Pavilion Plaza of the Dubai Expo on December 3, 2021. Constantini and the piano are elevated to a height of about five metres and the spectators watch from below. The event in the Gulf emirate will continue till the month of February. (Photo by AFP Photo/Stringer)
A girl looks on at a diver dressed as Santa Claus performing during a promotional event for Christmas in Seoul, South Korea on December 3, 2021. (Photo by Kim Hong-Ji/Reuters)
Rio Carnival's – La vie en rose – (Life in Pink) by Alexia Entsch costumes are displayed during a preview of the exhibition “Carnaval de Rio” organized at the CNCS (Centre national du Costume de Scene) in Moulins, center France, on December 2 2021. The exhibition, which will present more than 120 costumes from Rio de Janeiro, will take place from December 4 2021 to April 30 2022. (Photo by Thierry Zoccolan/AFP Photo)
Somali-American Halima Aden speaks during BoF VOICES 2021 at Soho Farmhouse on December 02, 2021 in Oxfordshire, England. (Photo by Samir Hussein/Getty Images for BoF VOICES)