People light candles at the Velvet Revolution memorial to commemorate the 31st anniversary of the 1989 Velvet Revolution, as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

A man wears a Covid-19 costume as people protest against restrictions due to the coronavirus disease (COVID-19) during the commemoration of the 31st anniversary of the 1989 Velvet Revolution, in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

People light candles at the Velvet Revolution memorial to commemorate the 31st anniversary of the 1989 Velvet Revolution, as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

People light candles at the Velvet Revolution memorial to commemorate the 31st anniversary of the 1989 Velvet Revolution, as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

People light candles at the Velvet Revolution memorial to commemorate the 31st anniversary of the 1989 Velvet Revolution, as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

People light candles at the Velvet Revolution memorial to commemorate the 31st anniversary of the 1989 Velvet Revolution, as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

People protest against restrictions due to the coronavirus disease (COVID-19) during the commemoration of the 31st anniversary of the 1989 Velvet Revolution, in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

Children light candles at Wenceslas Square to commemorate the 31st anniversary of the 1989 Velvet Revolution, as people protest restrictions due to the spread of the coronavirus disease (COVID-19) in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

A man lights candles at Wenceslas Square to commemorate the 31st anniversary of the 1989 Velvet Revolution, as people protest restrictions due to the spread of the coronavirus disease (COVID-19) in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

People protest against restrictions due to the coronavirus disease (COVID-19) during the commemoration of the 31st anniversary of the 1989 Velvet Revolution, in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

People protest against restrictions due to the coronavirus disease (COVID-19) during the commemoration of the 31st anniversary of the 1989 Velvet Revolution, in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

People protest against restrictions due to the coronavirus disease (COVID-19) during the commemoration of the 31st anniversary of the 1989 Velvet Revolution, in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

A woman lights a candle at Wenceslas Square to commemorate the 31st anniversary of the 1989 Velvet Revolution, as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

A man lights candles at Wenceslas Square to commemorate the 31st anniversary of the 1989 Velvet Revolution, as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

A woman lights a candle at Wenceslas Square to commemorate the 31st anniversary of the 1989 Velvet Revolution, as the spread of the coronavirus disease (COVID-19) continues in Prague, Czech Republic, November 17, 2020. REUTERS/David W Cerny

A view shows the restaurant Velvet in Xander hotel, where Russian opposition leader Alexei Navalny stayed during his recent visit, in Tomsk, Russia September 14, 2020. Navalny, who met allies ahead of upcoming regional elections in Tomsk, fell ill with suspected poisoning en route to Moscow on a plane, which made an emergency landing in Omsk, and was later airlifted to Berlin for medical treatment. Picture taken September 14, 2020. REUTERS/Maxim Shemetov

An assistant poses with Britain's Princess Diana's Victor Edelstein midnight-blue velvet evening gown (estimated at £250,000 - £350,000), which was worn by the princess when she danced with actor John Travolta at the White House in 1985. Also pictured is her Katherine Cusack evening gown (estimated at £20,000 -£30,000) and her Catherine Walker dress (estimated £4,000 - £6,000), at Kerry Taylor auctions in London, Britain December 8, 2019. REUTERS/Henry Nicholls

An assistant poses with Britain's Princess Diana's Victor Edelstein midnight-blue velvet evening gown (estimated at £250,000 - £350,000), which was worn by the princess when she danced with actor John Travolta at the White House in 1985. Also pictured is her Katherine Cusack evening gown (estimated at £20,000 -£30,000) and her Catherine Walker dress (estimated £4,000 - £6,000), at Kerry Taylor auctions in London, Britain December 8, 2019. REUTERS/Henry Nicholls

An assistant poses with Britain's Princess Diana's Victor Edelstein midnight-blue velvet evening gown (estimated at £250,000 - £350,000), which was worn by the princess when she danced with actor John Travolta at the White House in 1985. Also pictured is her Katherine Cusack evening gown (estimated at £20,000 -£30,000) and her Catherine Walker dress (estimated £4,000 - £6,000), at Kerry Taylor auctions in London, Britain December 8, 2019. REUTERS/Henry Nicholls

An assistant poses with Britain's Princess Diana's Victor Edelstein midnight-blue velvet evening gown (estimated at £250,000 - £350,000), which was worn by the princess when she danced with actor John Travolta at the White House in 1985. Also pictured is her Katherine Cusack evening gown (estimated at £20,000 -£30,000) and her Catherine Walker dress (estimated £4,000 - £6,000), at Kerry Taylor auctions in London, Britain December 8, 2019. REUTERS/Henry Nicholls

An assistant poses with Britain's Princess Diana's Victor Edelstein midnight-blue velvet evening gown (estimated at £250,000 - £350,000), which was worn by the princess when she danced with actor John Travolta at the White House in 1985. Also pictured is her Katherine Cusack evening gown (estimated at £20,000 -£30,000) and her Catherine Walker dress (estimated £4,000 - £6,000), at Kerry Taylor auctions in London, Britain December 8, 2019. REUTERS/Henry Nicholls

An assistant poses with Britain's Princess Diana's Victor Edelstein midnight-blue velvet evening gown (estimated at £250,000 - £350,000), which was worn by the princess when she danced with actor John Travolta at the White House in 1985. Also pictured is her Katherine Cusack evening gown (estimated at £20,000 -£30,000) and her Catherine Walker dress (estimated £4,000 - £6,000), at Kerry Taylor auctions in London, Britain December 8, 2019. REUTERS/Henry Nicholls

Britain's Princess Diana's Victor Edelstein midnight-blue velvet evening gown (estimated at £250,000 - £350,000), which was worn by the princess when she danced with actor John Travolta at the White House in 1985. Also pictured is her Katherine Cusack evening gown (estimated at £20,000 -£30,000) and her Catherine Walker dress (estimated £4,000 - £6,000), displayed at Kerry Taylor auctions in London, Britain December 8, 2019. REUTERS/Henry Nicholls

Britain's Princess Diana's Victor Edelstein midnight-blue velvet evening gown (estimated at £250,000 - £350,000), which was worn by the princess when she danced with actor John Travolta at the White House in 1985. Also pictured is her Katherine Cusack evening gown (estimated at £20,000 -£30,000) and her Catherine Walker dress (estimated £4,000 - £6,000), displayed at Kerry Taylor auctions in London, Britain December 8, 2019. REUTERS/Henry Nicholls

A blue velvet nudibranch crawls on the sand in front of a large sea cucumber in the Great Barrier Reef off the coast of Cairns, Australia October 26, 2019. REUTERS/Lucas Jackson

People lit candles during a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

People lit candles during a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Peopleare seen by candles during a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Peopleare seen by candles during a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Peopleare seen by candles during a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

People light candles during a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

People look at candle lights during a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

A woman waves a flag of Czech Republic during a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

People hold flags of Czech Republic on top of a building during a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

People hold flags of Czech Republic on top of a building during a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

People attend a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

General view of people attending a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

People attend a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

People attend a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

People attend a reenactment of the 1989 protest march to commemorate the 30th anniversary of the 1989 Velvet Revolution in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Slovakia's Prime Minister Peter Pellegrini speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Slovakia's Prime Minister Peter Pellegrini speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Hungary's Prime Minister Viktor Orban speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

President of the German Bundestag Wolfgang Schaeuble speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Hungary's Prime Minister Viktor Orban speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Poland's Prime Minister Mateusz Morawiecki speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Poland's Prime Minister Mateusz Morawiecki speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

President of the German Bundestag Wolfgang Schaeuble speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Czech Prime Minister Andrej Babis speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

General view of the venue before a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Czech Prime Minister Andrej Babis speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Czech Prime Minister Andrej Babis speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Czech Prime Minister Andrej Babis speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Czech Prime Minister Andrej Babis speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Czech Prime Minister Andrej Babis speaks during a ceremony marking the 30th anniversary of the 1989 Velvet Revolution at the National Museum in Prague, Czech Republic, November 17, 2019. REUTERS/David W Cerny

Demonstrators cast shadows at an anti-government rally, organised by Million Moments for Democracy, a day ahead of the 30th anniversary of the 1989 Velvet Revolution that led to the fall of Communism in former Czechoslovakia, in Prague, Czech Republic November 16, 2019. REUTERS/David W Cerny

Demonstrators hold signs at an anti-government protest, organised by Million Moments for Democracy, a day ahead of the 30th anniversary of the 1989 Velvet Revolution that led to the fall of Communism in former Czechoslovakia, in Prague, Czech Republic November 16, 2019. REUTERS/David W Cerny

Demonstrators hold signs at an anti-government protest, organised by Million Moments for Democracy, a day ahead of the 30th anniversary of the 1989 Velvet Revolution that led to the fall of Communism in former Czechoslovakia, in Prague, Czech Republic November 16, 2019. REUTERS/David W Cerny

Demonstrators hold signs at an anti-government protest, organised by Million Moments for Democracy, a day ahead of the 30th anniversary of the 1989 Velvet Revolution that led to the fall of Communism in former Czechoslovakia, in Prague, Czech Republic November 16, 2019. REUTERS/David W Cerny

Demonstrators wave Czech flags as others below gather at an anti-government rally, organised by Million Moments for Democracy, a day ahead of the 30th anniversary of the 1989 Velvet Revolution that led to the fall of Communism in former Czechoslovakia, in Prague, Czech Republic November 16, 2019. REUTERS/David W Cerny