French President Emmanuel Macron talks with workers during a visit at the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

A quiz on national security law is seen on a screen during an open day to mark the National Security Education Day at the Staff Training Institute of Correctional Services Department in Hong Kong, China April 15, 2021. REUTERS/Lam Yik

A woman checks a game booth during an open day to mark the National Security Education Day at the Staff Training Institute of Correctional Services Department in Hong Kong, China April 15, 2021. REUTERS/Lam Yik

Members of the Correctional Emergency Response Team (CERT) take part in an emergency drill during an open day to mark the National Security Education Day at the Staff Training Institute of Correctional Services Department in Hong Kong, China April 15, 2021. REUTERS/Lam Yik

Members of the Correctional Emergency Response Team (CERT) take part in an emergency drill during an open day to mark the National Security Education Day at the Staff Training Institute of Correctional Services Department in Hong Kong, China April 15, 2021. REUTERS/Lam Yik

A view shows the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

View of the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Police officers stand guard outside Windsor Castle, after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in Windsor, near London, Britain, April 15, 2021. REUTERS/Hannah McKay

Lyubov Sobol, a Russian opposition figure and a close ally of Kremlin critic Alexei Navalny, walks out of a court building in Moscow, Russia April 15, 2021. Russian state investigators accused Sobol of violently entering a flat reportedly owned by the family of a man, who Navalny and his supporters had said was an FSB security service officer involved in his poisoning. A message on Sobol's T-shirt reads: "Where is a criminal case into the poisoning of Navalny?" REUTERS/Tatyana Makeyeva

Formula One F1 - Emilia Romagna Grand Prix - Autodromo Enzo e Dino Ferrari, Imola, Italy - April 15, 2021 Aston Martin's Lance Stroll walks around the track with team members ahead of the Emilia Romagna Grand Prix REUTERS/Jennifer Lorenzini

Formula One F1 - Emilia Romagna Grand Prix - Autodromo Enzo e Dino Ferrari, Imola, Italy - April 15, 2021 Aston Martin's Lance Stroll walks around the track with team members ahead of the Emilia Romagna Grand Prix REUTERS/Jennifer Lorenzini

French President Emmanuel Macron talks with workers during a visit at the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

French President Emmanuel Macron talks with workers during a visit at the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

French President Emmanuel Macron talks with workers during a visit at the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

A view shows the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

A warden adjusts her hat outside Windsor castle, after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in Windsor, near London, Britain, April 15, 2021. REUTERS/Hannah McKay

Lyubov Sobol, a Russian opposition figure and a close ally of Kremlin critic Alexei Navalny, walks away after a court hearing in Moscow, Russia April 15, 2021. Russian state investigators accused Sobol of violently entering a flat reportedly owned by the family of a man, who Navalny and his supporters had said was an FSB security service officer involved in his poisoning. A message on Sobol's T-shirt reads: "Where is a criminal case into the poisoning of Navalny?" REUTERS/Tatyana Makeyeva

German Health Minister Jens Spahn attends a session of the lower house of parliament Bundestag in Berlin, Germany, April 15, 2021. REUTERS/Annegret Hilse

Workers at the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Youths take pictures on a hilltop overlooking Kabul, Afghanistan, April 15, 2021. REUTERS/Mohammad Ismail

Formula One F1 - Emilia Romagna Grand Prix - Autodromo Enzo e Dino Ferrari, Imola, Italy - April 15, 2021 AlphaTauri's Pierre Gasly walks around the track with a team member ahead of the Emilia Romagna Grand Prix REUTERS/Jennifer Lorenzini

A shoe polisher boy holds an umbrella as he waits for customers under graffiti on a wall in Kabul, Afghanistan April 15, 2021. REUTERS/Mohammad Ismail

An Afghan man holds an umbrella as he walks on a rainy day on a hilltop overlooking Kabul, Afghanistan, April 15, 2021. REUTERS/Mohammad Ismail

Workers at the reconstruction site of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Members of the Correctional Emergency Response Team (CERT) take part in an emergency drill during an open day to mark the National Security Education Day at the Staff Training Institute of Correctional Services Department in Hong Kong, China April 15, 2021. REUTERS/Lam Yik

Members of the Correctional Emergency Response Team (CERT) take part in an emergency drill during an open day to mark the National Security Education Day at the Staff Training Institute of Correctional Services Department in Hong Kong, China April 15, 2021. REUTERS/Lam Yik

German Health Minister Jens Spahn attends a session of the lower house of parliament Bundestag in Berlin, Germany, April 15, 2021. REUTERS/Annegret Hilse

French President Emmanuel Macron talks with workers during a visit at the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Correctional officers perform a drill during an open day to mark the National Security Education Day at the Staff Training Institute of Correctional Services Department in Hong Kong, China April 15, 2021. REUTERS/Lam Yik

French President Emmanuel Macron visits the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Lyubov Sobol, a Russian opposition figure and a close ally of Kremlin critic Alexei Navalny, speaks with journalists after a court hearing in Moscow, Russia April 15, 2021. Russian state investigators accused Sobol of violently entering a flat reportedly owned by the family of a man, who Navalny and his supporters had said was an FSB security service officer involved in his poisoning. REUTERS/Tatyana Makeyeva

Formula One F1 - Emilia Romagna Grand Prix - Autodromo Enzo e Dino Ferrari, Imola, Italy - April 15, 2021 Aston Martin's Sebastian Vettel walks around the track ahead of the Emilia Romagna Grand Prix REUTERS/Jennifer Lorenzini

French President Emmanuel Macron and Paris Mayor Anne Hidalgo visit the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Free Democratic Party (FDP) member Wieland Schinnenburg shows a mirror towards the far-right Alternative for Germany (AfD) fraction during a session of the lower house of parliament Bundestag in Berlin, Germany, April 15, 2021. REUTERS/Annegret Hilse

A visitor poses for pictures with a board featuring Stanley Prison during an open day to mark the National Security Education Day at the Staff Training Institute of Correctional Services Department in Hong Kong, China April 15, 2021. REUTERS/Lam Yik

Youths take pictures near an Afghan flag on a hilltop overlooking Kabul, Afghanistan, April 15, 2021. REUTERS/Mohammad Ismail

Correctional officers perform a drill during an open day to mark the National Security Education Day at the Staff Training Institute of Correctional Services Department in Hong Kong, China April 15, 2021. REUTERS/Lam Yik

Youths take pictures next to an Afghan flag on a hilltop overlooking Kabul, Afghanistan, April 15, 2021. REUTERS/Mohammad Ismail

An Afghan man holds an umbrella as he looks on while standing on a hilltop overlooking Kabul, Afghanistan, April 15, 2021. REUTERS/Mohammad Ismail

Lyubov Sobol, a Russian opposition figure and a close ally of Kremlin critic Alexei Navalny, leaves a court building after a hearing in Moscow, Russia April 15, 2021. Russian state investigators accused Sobol of violently entering a flat reportedly owned by the family of a man, who Navalny and his supporters had said was an FSB security service officer involved in his poisoning. REUTERS/Tatyana Makeyeva

German Minister of State for Digitalization Dorothee Baer attends a session of the lower house of parliament Bundestag in Berlin, Germany, April 15, 2021. REUTERS/Annegret Hilse

Journalists work as French President Emmanuel Macron and Paris Mayor Anne Hidalgo visit the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Formula One F1 - Emilia Romagna Grand Prix - Autodromo Enzo e Dino Ferrari, Imola, Italy - April 15, 2021 Alfa Romeo's Antonio Giovinazzi walks around the track ahead of the Emilia Romagna Grand Prix REUTERS/Jennifer Lorenzini

Formula One F1 - Emilia Romagna Grand Prix - Autodromo Enzo e Dino Ferrari, Imola, Italy - April 15, 2021 Alfa Romeo's Antonio Giovinazzi walks around the track ahead of the Emilia Romagna Grand Prix REUTERS/Jennifer Lorenzini

A worker at the reconstruction site of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

French President Emmanuel Macron and Paris Mayor Anne Hidalgo visit the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

A worker at the reconstruction site of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

French President Emmanuel Macron visits the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Journalists work at the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Police officers patrol on the Long Walk in front of Windsor castle, after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in Windsor, near London, Britain, April 15, 2021. REUTERS/Phil Noble

A worker walks on scaffolding at the reconstruction site of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Oleksandr Petriv, a member of the Ukrainian Olympic shooting team that will compete in the Tokyo 2020 Olympics, receives a dose of Chinese-developed CoronaVac vaccine against the coronavirus disease (COVID-19) in Kyiv, Ukraine April 15, 2021. REUTERS/Valentyn Ogirenko

Pedestrians stand on an overpass above car traffic amid a duststorm in Beijing, China April 15, 2021. REUTERS/Tingshu Wang

Workers are seen at a construction site for a residential building, in Berlin, Germany, April 15, 2021. REUTERS/Michele Tantussi

Workers are seen at a construction site for a residential building, in Berlin, Germany, April 15, 2021. REUTERS/Michele Tantussi

A billboard announcing "Flat for rent" is seen near a residential building, in Berlin, Germany, April 15, 2021. REUTERS/Michele Tantussi

Workers are seen at a construction site for a residential building, in Berlin, Germany, April 15, 2021. REUTERS/Michele Tantussi

View of the reconstruction site of the roof of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Workers at the reconstruction site of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool

Workers at the reconstruction site of the Notre-Dame de Paris Cathedral, which was damaged in a devastating fire two years ago, as restoration works continue, in Paris, France, April 15, 2021. REUTERS/Benoit Tessier/Pool