A TUI Airways flight from Dusseldorf lands at Ioannis Kapodistrias International Airport, as the country's tourism season officially opens, on the island of Corfu, Greece, May 15, 2021. REUTERS/Adonis Skordilis

A TUI Airways flight from Frankfurt lands at Ioannis Kapodistrias International Airport, as the country's tourism season officially opens, on the island of Corfu, Greece, May 15, 2021. REUTERS/Adonis Skordilis

Passengers of TUI Airways flight from Dusseldorf prepare to board a bus outside Ioannis Kapodistrias International Airport, as the country's tourism season officially opens, on the island of Corfu, Greece, May 15, 2021. REUTERS/Adonis Skordilis

Passengers of TUI Airways flight from Dusseldorf arrive at Ioannis Kapodistrias International Airport, as the country's tourism season officially opens, on the island of Corfu, Greece, May 15, 2021. REUTERS/Adonis Skordilis

Passengers of TUI Airways flight from Dusseldorf arrive at Ioannis Kapodistrias International Airport, as the country's tourism season officially opens, on the island of Corfu, Greece, May 15, 2021. REUTERS/Adonis Skordilis

A French soldier trains during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

U.S. Marines train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

Japanese soldiers and U.S. Marines train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

A French soldier trains during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

A Chinook helicopter flies over a field during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

Japan's State Minister of Defense Yasuhide Nakayama, France's Ambassador to Japan, Philippe Setton and Australia?s Ambassador to Japan, Jan Adams pose for pictures during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

A Japanese soldier trains during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

Japanese soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

A U.S. Marine trains during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French and Japanese soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

A French soldier trains during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

Japanese soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

Japanese soldier trains during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

Japanese soldiers and a U.S. Marine (bottom) train during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French Army Lieutenant-Colonel Henri Marcaillou (L), Japan's Self-Defense Forces' Colonel Masashi Hiraki, U.S. Marines Lieutenant Colonel Jeremy Nelson (R) pose for pictures after a presser following a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French Army Lieutenant-Colonel Henri Marcaillou (L), Japan's Self-Defense Forces' Colonel Masashi Hiraki, U.S. Marines Lieutenant Colonel Jeremy Nelson (R) pose for pictures after a presser following a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

Japanese soldiers sit near a Chinook helicopter during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers walk in a field near a Chinook helicopter during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

A Chinook helicopter flies over a field during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers stand in a field during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers walk into a Chinook helicopter during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

French soldiers walk from a Chinook helicopter during a joint military drill between Japan Self-Defense Forces, French Army and U.S. Marines, at the Kirishima exercise area in Ebino, Miyazaki prefecture, Japan May 15, 2021. Charly Triballeau/Pool via REUTERS

Passengers arriving from Germany and Switzerland stand with their luggage outside the terminal of the Heraklion airport, as the country's tourism season officially opens, on the island of Crete, Greece, May 15, 2021. REUTERS/Stefanos Rapanis

A woman wearing a protective face mask stands with to her luggage as passengers from Germany and Switzerland arrive at the Heraklion airport, during the country's official tourism season opening, on the island of Crete, Greece, May 15, 2021. REUTERS/Stefanos Rapanis

Passengers arriving from Germany and Switzerland line up outside the terminal of the Heraklion airport, as the country's tourism season officially opens, on the island of Crete, Greece, May 15, 2021. REUTERS/Stefanos Rapanis

Passengers arriving from Germany and Switzerland exit the terminal of the Heraklion airport, as the country's tourism season officially opens, on the island of Crete, Greece, May 15, 2021. REUTERS/Stefanos Rapanis

A man waves his hat as passengers arriving from Germany and Switzerland exit the terminal of the Heraklion airport, as the country's tourism season officially opens, on the island of Crete, Greece, May 15, 2021. REUTERS/Stefanos Rapanis

Passengers arriving from Germany and Switzerland stand with their luggage outside the terminal of the Heraklion airport, as the country's tourism season officially opens, on the island of Crete, Greece, May 15, 2021. REUTERS/Stefanos Rapanis

Police officers stand at a check point near a closed mosque on Ramadan day after the government imposed all-island travel restrictions due to the high increasing numbers of daily COVID-19 cases, in Colombo, Sri Lanka May 14, 2021. REUTERS/Dinuka Liyanawatte

Men wearing protective masks stand behind a locked iron gate in a residential area after the government imposed all-island travel restrictions due to the high increasing numbers of daily COVID-19 cases, in Colombo, Sri Lanka May 14, 2021. REUTERS/Dinuka Liyanawatte

A police officer asks a man on the street to return home after the government imposed all-island travel restrictions due to the high increasing numbers of daily COVID-19 cases, in Colombo, Sri Lanka May 14, 2021. REUTERS/Dinuka Liyanawatte

Police officers ask a man on the street to return home after the government imposed all-island travel restrictions due to the high increasing numbers of daily COVID-19 cases, in Colombo, Sri Lanka May 14, 2021. REUTERS/Dinuka Liyanawatte

A police officer asks people on the street to return home after the government imposed all-island travel restrictions due to the high increasing numbers of daily COVID-19 cases, in Colombo, Sri Lanka May 14, 2021. REUTERS/Dinuka Liyanawatte

A police officer stands guard on a main road after the government imposed all-island travel restrictions due to the high increasing numbers of daily COVID-19 cases, in Colombo, Sri Lanka May 14, 2021. REUTERS/Dinuka Liyanawatte

Muslims visit Coney Island amusement park after Eid al-Fitr prayers in the Brooklyn borough of New York City, New York, U.S., May 13, 2021. REUTERS/Stephanie Keith

Muslims visit Coney Island amusement park after Eid al-Fitr prayers in the Brooklyn borough of New York City, New York, U.S., May 13, 2021. REUTERS/Stephanie Keith

MTA security contractor Janet Santiago reacts after she received a shot of the Johnson & Johnson vaccine for the coronavirus disease (COVID-19) during the opening of MTA's public vaccination program at the Coney Island subway station in the Brooklyn borough of New York City, New York, U.S., May 12, 2021. REUTERS/Brendan McDermid

Commuters receive the Johnson & Johnson vaccine for the coronavirus disease (COVID-19) during the opening of MTA's public vaccination program at the Coney Island subway station in the Brooklyn borough of New York City, New York, U.S., May 12, 2021. REUTERS/Brendan McDermid

MTA security contractor Janet Santiago prepares to receive a shot of the Johnson & Johnson vaccine for the coronavirus disease (COVID-19) during the opening of MTA's public vaccination program at the Coney Island subway station in the Brooklyn borough of New York City, New York, U.S., May 12, 2021. REUTERS/Brendan McDermid

A commuter receives a shot of the Johnson & Johnson vaccine for the coronavirus disease (COVID-19) during the opening of MTA's public vaccination program at the Coney Island subway station in the Brooklyn borough of New York City, New York, U.S., May 12, 2021. REUTERS/Brendan McDermid

MTA security contractor Janet Santiago receives a shot of the Johnson & Johnson vaccine for the coronavirus disease (COVID-19) during the opening of MTA's public vaccination program at the Coney Island subway station in the Brooklyn borough of New York City, New York, U.S., May 12, 2021. REUTERS/Brendan McDermid

Felix Rodriguez wears a protective face mask as he talks to a client beside images of late Cuban President Fidel Castro and Cuba's former President and First Secretary of the Communist Party Raul Castro in a subsidized state store amid concerns about the spread of the coronavirus disease (COVID-19), in Havana, Cuba, May 12, 2021. REUTERS/Alexandre Meneghini

A woman leaves a vaccination center amid concerns about the spread of the coronavirus disease (COVID-19), in Havana, Cuba, May 12, 2021. REUTERS/Alexandre Meneghini

People wait in line to enter a vaccination center amid concerns about the spread of the coronavirus disease (COVID-19), in Havana, Cuba, May 12, 2021. REUTERS/Alexandre Meneghini

A ship that transported migrants is seen at the Mediterranean island of Lampedusa, with more than two thousand having arrived over the last few days, in Lampedusa, Italy May 11, 2021. REUTERS/Antonio Parrinello