A security guard stands next to a gate, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in Red Square in central Moscow, Russia March 31, 2020. REUTERS/Maxim Shemetov

A police officer wearing a protective mask walks across Red Square, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in central Moscow, Russia March 31, 2020. REUTERS/Maxim Shemetov TPX IMAGES OF THE DAY

Law enforcement officers stand guard in front of the Mausoleum of Soviet state founder Vladimir Lenin, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in Red Square in central Moscow, Russia March 31, 2020. REUTERS/Maxim Shemetov

Police officers wearing protective masks gather while patrolling streets, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in central Moscow, Russia March 31, 2020. REUTERS/Maxim Shemetov

Police officers patrol Red Square, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in central Moscow, Russia March 31, 2020. REUTERS/Maxim Shemetov

Police officers wearing protective masks stand guard outside the State Department Store, GUM, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in Red Square in central Moscow, Russia March 31, 2020. REUTERS/Maxim Shemetov

St. Basil's Cathedral and the Kremlin's Spasskaya Tower are reflected in a puddle in Red Square, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in central Moscow, Russia March 31, 2020. REUTERS/Maxim Shemetov

A police officer gives instructions to pedestrians, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in Red Square in central Moscow, Russia March 31, 2020. REUTERS/Maxim Shemetov

People walk past the State Department Store, GUM, in Red Square, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in central Moscow, Russia March 31, 2020. REUTERS/Maxim Shemetov

A man walks in Red Square, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in central Moscow, Russia March 31, 2020. REUTERS/Maxim Shemetov

A walks past the St. Basil's Cathedral in Red Square, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in central Moscow, Russia March 30, 2020. REUTERS/Evgenia Novozhenina

A walks past the St. Basil's Cathedral in Red Square, after the city authorities announced a partial lockdown ordering residents to stay at home to prevent the spread of coronavirus disease (COVID-19), during snowfall in central Moscow, Russia March 30, 2020. REUTERS/Evgenia Novozhenina

A car drives along a street during snowfall in Kiev, Ukraine March 22, 2020. REUTERS/Gleb Garanich

A man wearing a protective mask as a preventive measure against coronavirus disease (COVID-19) carries a shopping bag near a supermarket during snowfall in Kiev, Ukraine March 22, 2020. REUTERS/Gleb Garanich TPX IMAGES OF THE DAY

Snowfall covers the town of Dyatlovo, Belarus March 21, 2020. REUTERS/Vasily Fedosenko

A man, wearing protective face mask, following an outbreak of the coronavirus disease (COVID-19), walks on a street during a snowfall in Tokyo, Japan March 14, 2020. REUTERS/Stoyan Nenov

A man, wearing protective face mask, following an outbreak of the coronavirus disease (COVID-19), walks on Ginza boulevard during a snowfall in Tokyo, Japan March 14, 2020. REUTERS/Stoyan Nenov

A man, wearing protective face mask, following an outbreak of the coronavirus disease (COVID-19), walks on Ginza boulevard during a snowfall in Tokyo, Japan March 14, 2020. REUTERS/Stoyan Nenov TPX IMAGES OF THE DAY

A view shows figures of camels at Chelyabinsk Pipe Rolling Plant owned by ChelPipe Group during snowfall in Chelyabinsk, Russia February 26, 2020. Picture taken February 26, 2020. REUTERS/Maxim Shemetov

A woman with a dog walks during heavy snowfall in Minsk, Belarus February 24, 2020. REUTERS/Vasily Fedosenko

A man with a pram walks during heavy snowfall in Minsk, Belarus February 24, 2020. REUTERS/Vasily Fedosenko

A bear is seen in its enclosure at the zoo during snowfall in the village of Prydorozhnje, Donetsk region, Ukraine February 21, 2020. REUTERS/Alexander Ermochenko

A black swan swims at a zoo during snowfall in Almaty, Kazakhstan February 16, 2020. REUTERS/Pavel Mikheyev

A worker wearing a face mask cleans the ground amid snowfall, following an outbreak of the novel coronavirus in the country, on Valentine's Day at the Sanlitun shopping area in Beijing, China February 14, 2020. REUTERS/Tingshu Wang

Workers wearing face masks clean the ground of a food court amid snowfall, following an outbreak of the novel coronavirus in the country, on Valentine's Day at the Sanlitun shopping area in Beijing, China February 14, 2020. REUTERS/Tingshu Wang

A woman wearing a face mask holds an umbrella amid snowfall on a street, following an outbreak of the novel coronavirus in the country, at Sanlitun shopping area on Valentine's Day in Beijing, China February 14, 2020. REUTERS/Tingshu Wang

An Ele.me deliveryman wearing a face mask delivers food amid snowfall, following an outbreak of the novel coronavirus in the country, at a shopping area on Valentine's Day in Beijing, China February 14, 2020. REUTERS/Tingshu Wang

An Ele.me deliveryman wearing a face mask delivers food amid snowfall, following an outbreak of the novel coronavirus in the country, at a shopping area on Valentine's Day in Beijing, China February 14, 2020. REUTERS/Tingshu Wang

A man takes pictures as a woman poses with an umbrella amid snowfall, following an outbreak of the novel coronavirus in the country, on Valentine's Day at the Sanlitun shopping area in Beijing, China February 14, 2020. REUTERS/Tingshu Wang

Pedestrians wearing face masks walk under an umbrella amid snowfall following an outbreak of the novel coronavirus in the country, on Valentine's Day at a shopping area in Beijing, China February 14, 2020. REUTERS/Tingshu Wang

A couple wearing face masks walks at the Sanlitun shopping area amid snowfall, following an outbreak of the novel coronavirus in the country, on Valentine's Day in Beijing, China February 14, 2020. REUTERS/Tingshu Wang

People walk during heavy snowfall in Minsk, Belarus February 12, 2020. REUTERS/Vasily Fedosenko

A man with a pram walks during heavy snowfall in Minsk, Belarus February 12, 2020. REUTERS/Vasily Fedosenko

A man gets out of a car during heavy snowfall in Minsk, Belarus February 12, 2020. REUTERS/Vasily Fedosenko

People walk during heavy snowfall in Minsk, Belarus February 12, 2020. REUTERS/Vasily Fedosenko TPX IMAGES OF THE DAY

A man walks during heavy snowfall in Minsk, Belarus February 12, 2020. REUTERS/Vasily Fedosenko

A man walks during heavy snowfall in Minsk, Belarus February 12, 2020. REUTERS/Vasily Fedosenko

A woman wearing a face mask takes selfies after snowfall outside the Forbidden City, as the country is hit by an outbreak of the new coronavirus, in Beijing, China February 6, 2020. REUTERS/Carlos Garcia Rawlins SEARCH "CHINA GHOST" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

Children ski during snowfall in Stavropol, Russia February 8, 2020. REUTERS/Eduard Korniyenko

A woman wearing a face mask holds an umbrella during snowfall, as the country is hit by an outbreak of the novel coronavirus, in Beijing, China February 6, 2020. REUTERS/Carlos Garcia Rawlins

A man wearing a face mask walks at a residential complex during a snowfall, as the country is hit by an outbreak of the new coronavirus, in Beijing, China February 2, 2020. REUTERS/Carlos Garcia Rawlins

A woman wearing a face mask walks at a residential complex after a snowfall, as the country is hit by an outbreak of the new coronavirus, in Beijing, China February 2, 2020. REUTERS/Carlos Garcia Rawlins

People wearing face masks walk at a residential complex during a snowfall, as the country is hit by an outbreak of the new coronavirus, in Beijing, China February 2, 2020. REUTERS/Carlos Garcia Rawlins

A man wearing a face mask takes photos with his cellphone during a snowfall at a residential complex, as the country is hit by an outbreak of the new coronavirus, in Beijing, China February 2, 2020. REUTERS/Carlos Garcia Rawlins

A woman wearing a mask waits for a bus at a station after a snowfall in Beijing, China, as the country is hit by an outbreak of the new coronavirus, February 2, 2020. REUTERS/Jason Lee

A woman wearing a mask waits for a bus at a station after a snowfall in Beijing, China, as the country is hit by an outbreak of the new coronavirus, February 2, 2020. REUTERS/Jason Lee

A man wearing a mask walks along a street after a snowfall in Beijing, China, as the country is hit by an outbreak of the new coronavirus, February 2, 2020. REUTERS/Jason Lee

A woman wearing a mask cycles along a road after a snowfall in Beijing, China, as the country is hit by an outbreak of the new coronavirus, February 2, 2020. REUTERS/Jason Lee

A woman wearing a mask walks past vehicles after a snowfall in Beijing, China, as the country is hit by an outbreak of the new coronavirus, February 2, 2020. REUTERS/Jason Lee

People walk past a Soviet-era military aircraft exhibited in Victory Park during snowfall in Stavropol, Russia January 31, 2020. REUTERS/Eduard Korniyenko

A bicycle rider passes by a street installation during snowfall in Stavropol, Russia January 31, 2020. REUTERS/Eduard Korniyenko

A pedestrian with an umbrella walks during snowfall in Stavropol, Russia January 23, 2020. REUTERS/Eduard Korniyenko

A bird sits on a frozen river during a snowfall in Des Moines, Iowa, U.S., January 22, 2020. REUTERS/Ivan Alvarado

A dancer practices dance steps while recording a video at Des Moines Capitol area during a snowfall in Des Moines, Iowa, U.S., January 22, 2020. REUTERS/Ivan Alvarado

A view of Des Moines Capitol during a snowfall in Des Moines, Iowa, U.S., January 22, 2020. REUTERS/Ivan Alvarado TPX IMAGES OF THE DAY

A dancer practices dance steps while recording a video in front of Des Moines Capitol during a snowfall in Des Moines, Iowa, U.S., January 22, 2020. REUTERS/Ivan Alvarado

A man carries a child during heavy snowfall and wind in Minsk, Belarus January 22, 2020. REUTERS/Vasily Fedosenko

People walk during heavy snowfall and wind in Minsk, Belarus January 22, 2020. REUTERS/Vasily Fedosenko