U.S. Secretary of Defense Lloyd Austin fixes a protective mask against the coronavirus (COVID-19) pandemic following a news conference with his German counterpart Annegret Kramp-Karrenbauer at the Bendlerblock German Ministry of Defense in Berlin, Germany, April 13, 2021. Kay Nietfeld/Pool via REUTERS

U.S. Secretary of Defense Lloyd Austin is pictured following a news conference with his German counterpart Annegret Kramp-Karrenbauer at the Bendlerblock German Ministry of Defense in Berlin, Germany, April 13, 2021. Kay Nietfeld/Pool via REUTERS

A nurse prepares to use AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

U.S. Secretary of Defense Lloyd Austin is pictured at a news conference with his German counterpart Annegret Kramp-Karrenbauer at the Bendlerblock German Ministry of Defense in Berlin, Germany, April 13, 2021. Kay Nietfeld/Pool via REUTERS

Tennis - ATP Masters 1000 - Monte Carlo Masters - Monte-Carlo Country Club, Roquebrune-Cap-Martin, France - April 13, 2021 Canada's Felix Auger Aliassime in action during his first round match against Chile's Cristian Garin REUTERS/Eric Gaillard

Syringes with AstraZeneca coronavirus disease (COVID-19) vaccines are prepared in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

Tennis - ATP Masters 1000 - Monte Carlo Masters - Monte-Carlo Country Club, Roquebrune-Cap-Martin, France - April 13, 2021 Canada's Felix Auger Aliassime in action during his first round match against Chile's Cristian Garin REUTERS/Eric Gaillard

U.S. Secretary of Defense Lloyd Austin fixes a protective mask against the coronavirus (COVID-19) pandemic following a news conference with his German counterpart Annegret Kramp-Karrenbauer at the Bendlerblock German Ministry of Defense in Berlin, Germany, April 13, 2021. Kay Nietfeld/Pool via REUTERS

People wear protective face masks as they buy food for breaking the fast during the holy fasting month of Ramadan, amid the coronavirus disease (COVID-19) pandemic, in Jakarta, Indonesia, April 13, 2021. REUTERS/Ajeng Dinar Ulfiana

A vendor wearing a protective face mask waits for customers at a street food shop during the holy fasting month of Ramadan, amid the coronavirus disease (COVID-19) pandemic, in Jakarta, Indonesia, April 13, 2021. REUTERS/Ajeng Dinar Ulfiana

U.S. Secretary of Defense Lloyd Austin and his German counterpart Annegret Kramp-Karrenbauer leave a news conference at the Bendlerblock German Ministry of Defense in Berlin, Germany, April 13, 2021. Kay Nietfeld/Pool via REUTERS

A nurse prepares to use AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

A woman receives a dose of AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

A man receives a dose of AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

A woman receives a dose of AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

A nurse prepares to use AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

A nurse prepares to use AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

A nurse prepares to use AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

People wear protective face masks as they buy food for breaking the fast during the holy fasting month of Ramadan, amid the coronavirus disease (COVID-19) pandemic, in Jakarta, Indonesia, April 13, 2021. REUTERS/Ajeng Dinar Ulfiana

People wear protective face masks as they sell food for breaking the fast during the holy fasting month of Ramadan, amid the coronavirus disease (COVID-19) pandemic in Jakarta, Indonesia, April 13, 2021. REUTERS/Ajeng Dinar Ulfiana

A nurse prepares a dose of AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

Boxers train at the Sempione park, after Lombardy was downgraded from a red to an orange zone, loosening the coronavirus disease (COVID-19) restrictions including allowing non-essential shops to re-open, in Milan, Italy, April 13, 2021. REUTERS/Flavio Lo Scalzo

A man receives a dose of the AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

A volunteer wearing a face mask as a protection against the coronavirus disease (COVID-19) gives a ration of stew to low-income people in a plastic container at a soup kitchen organized at the home of Aida Mariela Unayche, in Manzanares, on the outskirts of Buenos Aires, Argentina April 8, 2021. Picture taken April 8, 2021. REUTERS/Agustin Marcarian

Maria Nunez, 42, stretches the sheets at her home, in Manzanares, on the outskirts of Buenos Aires, Argentina April 8, 2021. Picture taken April 8, 2021. REUTERS/Agustin Marcarian

Aida Mariela Unayche, 43, stands at her room as she wears a face mask as a protection against the spread of the coronavirus disease (COVID-19), in Manzanares, on the outskirts of Buenos Aires, Argentina April 8, 2021. Picture taken April 8, 2021. REUTERS/Agustin Marcarian

People wait after receiving the first dose of he AstraZeneca coronavirus disease (COVID-19) vaccine in Fasano Italy, April 13, 2020. REUTERS/Alessandro Garofalo

Aida Mariela Unayche, 43, stands at the door of her home as she wears a face mask as a protection against the spread of the coronavirus disease (COVID-19), in Manzanares, on the outskirts of Buenos Aires, Argentina April 8, 2021. Picture taken April 8, 2021. REUTERS/Agustin Marcarian

A volunteer serves a ration of stew in a plastic container at a soup kitchen organized at the home of Aida Mariela Unayche, in Manzanares, on the outskirts of Buenos Aires, Argentina April 8, 2021. Picture taken April 8, 2021. REUTERS/Agustin Marcarian

Jaqueline Romero, 23, stands outside her home, in Manzanares, on the outskirts of Buenos Aires, Argentina April 8, 2021. Picture taken April 8, 2021. REUTERS/Agustin Marcarian

Gabriel Unayche, son of Aida Mariela Unayche, eats a ration of stew at his home, in Manzanares, on the outskirts of Buenos Aires, Argentina April 8, 2021. Picture taken April 8, 2021. REUTERS/Agustin Marcarian

Boys play with toys, in Manzanares, on the outskirts of Buenos Aires, Argentina April 8, 2021. Picture taken April 8, 2021. REUTERS/Agustin Marcarian

Aida Mariela Unayche, 43, gets emotional as she speaks with Reuters outside her home, in Manzanares, on the outskirts of Buenos Aires, Argentina April 8, 2021. Picture taken April 8, 2021. REUTERS/Agustin Marcarian

Jaqueline Romero, 23, talks with her sisters at their home, in Manzanares, on the outskirts of Buenos Aires, Argentina April 8, 2021. Picture taken April 8, 2021. REUTERS/Agustin Marcarian

German Chancellor Angela Merkel gives a statement, amid the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, April 13, 2021. REUTERS/Annegret Hilse/Pool

German Chancellor Angela Merkel gives a statement, amid the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, April 13, 2021. REUTERS/Annegret Hilse/Pool

Austrian Vice Chancellor Werner Kogler and designated Health Minister Wolfgang Mueckstein leave after a news conference in Vienna, Austria April 13, 2021. REUTERS/Leonhard Foeger

German Chancellor Angela Merkel leaves after giving a statement, amid the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, April 13, 2021. REUTERS/Annegret Hilse/Pool

German Chancellor Angela Merkel leaves after giving a statement, amid the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, April 13, 2021. REUTERS/Annegret Hilse/Pool

German Chancellor Angela Merkel leaves after giving a statement, amid the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, April 13, 2021. REUTERS/Annegret Hilse/Pool

German Chancellor Angela Merkel adjusts her face mask as she arrives to give a statement, amid the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, April 13, 2021. REUTERS/Annegret Hilse/Pool

German Chancellor Angela Merkel gives a statement, amid the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, April 13, 2021. REUTERS/Annegret Hilse/Pool

German Chancellor Angela Merkel gives a statement, amid the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, April 13, 2021. REUTERS/Annegret Hilse/Pool

Funeral ceremonial del príncipe Felipe

Les funérailles du prince Philippe, le duc d'Edimbourg, auront lieu le 17 avril à la chapelle St George du château de Windsor.

German Chancellor Angela Merkel adjusts her face mask as she arrives to give a statement, amid the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, April 13, 2021. REUTERS/Annegret Hilse/Pool

German Chancellor Angela Merkel arrives to give a statement, amid the coronavirus disease (COVID-19) outbreak, in Berlin, Germany, April 13, 2021. REUTERS/Annegret Hilse/Pool

A farmer spreads nitrogen fertilizer in his wheat field in Blecourt, France, April 13, 2021. REUTERS/Pascal Rossignol

A farmer spreads nitrogen fertilizer in his wheat field in Blecourt, France, April 13, 2021. REUTERS/Pascal Rossignol

Children lay flowers outside Windsor castle, after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in Windsor, near London, Britain April 13, 2021. REUTERS/Matthew Childs

A healthcare worker checks the temperature of a rice mill worker during a coronavirus disease (COVID-19) vaccination drive at Bavla village on the outskirts of Ahmedabad, India, April 13, 2021. REUTERS/Amit Dave

Beds with oxygen support are seen at a recently constructed quarantine facility for patients diagnosed with the coronavirus disease (COVID-19), in Mumbai, India, April 13, 2021 REUTERS/Francis Mascarenhas

Austrian Vice Chancellor Werner Kogler and designated Health Minister Wolfgang Mueckstein attend a news conference in Vienna, Austria April 13, 2021. REUTERS/Leonhard Foeger

People of ages 70 to 74 years old receive their first dose of the Pfizer/BioNTech coronavirus disease (COVID-19) vaccine, as the outbreak continues, in a conference hall at Gregorio Maranon hospital in Madrid, Spain, April 13, 2021. REUTERS/Sergio Perez

Designated Health Minister Wolfgang Mueckstein attends a news conference in Vienna, Austria April 13, 2021. REUTERS/Leonhard Foeger

Windsor Castle Wardens and armed police officers stand outside the castle, after Britain's Prince Philip, husband of Queen Elizabeth, died at the age of 99, in Windsor, near London, Britain April 13, 2021. REUTERS/Peter Nicholls

Designated Health Minister Wolfgang Mueckstein attends a news conference in Vienna, Austria April 13, 2021. REUTERS/Leonhard Foeger

A protester wears a mask of German Chancellor Angela Merkel during protests against coronavirus disease (COVID-19) related measures by the German government, in front of the Chancellery in Berlin, Germany April 13, 2021. REUTERS/Annegret Hilse

Austrian Vice Chancellor Werner Kogler (not pictured) and designated Health Minister Wolfgang Mueckstein attend a news conference in Vienna, Austria April 13, 2021. REUTERS/Leonhard Foeger

A protester wears a mask of German Chancellor Angela Merkel during protests against coronavirus disease (COVID-19) related measures by the German government, in front of the Chancellery in Berlin, Germany April 13, 2021. REUTERS/Annegret Hilse