Greek Prime Minister Kyriakos Mitsotakis waits to welcome the head of the Presidential Council of Libya Mohamed al-Menfi at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Greek Prime Minister Kyriakos Mitsotakis welcomes the head of the Presidential Council of Libya Mohamed al-Menfi at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Greek Prime Minister Kyriakos Mitsotakis welcomes the head of the Presidential Council of Libya Mohamed al-Menfi at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Greek Prime Minister Kyriakos Mitsotakis welcomes the head of the Presidential Council of Libya Mohamed al-Menfi at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Mohamed al-Menfi, head of the Presidential Council of Libya, poses for a photo as he is welcomed by Greek Prime Minister Kyriakos Mitsotakis at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Greek Prime Minister Kyriakos Mitsotakis welcomes the head of the Presidential Council of Libya Mohamed al-Menfi at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Greek Prime Minister Kyriakos Mitsotakis waits to welcome the head of the Presidential Council of Libya Mohamed al-Menfi at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Greek Prime Minister Kyriakos Mitsotakis welcomes the head of the Presidential Council of Libya Mohamed al-Menfi at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Greek Prime Minister Kyriakos Mitsotakis welcomes the head of the Presidential Council of Libya Mohamed al-Menfi at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Greek Prime Minister Kyriakos Mitsotakis welcomes the head of the Presidential Council of Libya Mohamed al-Menfi at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Greek Prime Minister Kyriakos Mitsotakis welcomes the head of the Presidential Council of Libya Mohamed al-Menfi at the Maximos Mansion, in Athens, Greece, April 14, 2021. REUTERS/Costas Baltas

Dutch tourists, who will spend a week long holiday in isolation as part of an experiment, arrive at the their tourist resort the Mitsis Grand Hotel Beach, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation as part of an experiment, stand on their balconies at the a tourist resort the Mitsis Grand Hotel Beach, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation as part of an experiment, stand on their balconies at the a tourist resort the Mitsis Grand Hotel Beach, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation as part of an experiment, arrive at the their tourist resort the Mitsis Grand Hotel Beach, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation as part of an experiment, arrive at the their tourist resort the Mitsis Grand Hotel Beach, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

A dutch tourist, one of who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrives at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

Dutch tourists, who will spend a week long holiday in isolation in their tourist resort as part of an experiment, arrive at the Rhodes International Airport, amid the coronavirus disease (COVID-19) outbreak on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

General view of a gate to the Mitsis Grand Hotel Beach amid the coronavirus disease (COVID-19) outbreak in Rhodes on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

People are seen at a balcony of the Mitsis Grand Hotel Beach amid the coronavirus disease (COVID-19) outbreak in Rhodes on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

General view of the Mitsis Grand Hotel Beach amid the coronavirus disease (COVID-19) outbreak in Rhodes on the island of Rhodes, Greece April 12, 2021. REUTERS/Louiza Vradi

General view of the Mitsis Grand Hotel Beach amid the coronavirus disease (COVID-19) outbreak in Rhodes on the island of Rhodes, Greece April 12, 2021. Picture taken with a drone. REUTERS/Louiza Vradi

A view of the interior of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. Picture taken April 10, 2021. REUTERS/Alkis Konstantinidis

A view of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. Picture taken April 10, 2021. REUTERS/Alkis Konstantinidis

A view of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. Picture taken April 10, 2021. Picture taken with a drone. REUTERS/Alkis Konstantinidis

A view of the interior of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. Picture taken April 10, 2021. REUTERS/Alkis Konstantinidis

A man jogs past Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. Picture taken April 10, 2021. REUTERS/Alkis Konstantinidis

A view of the interior of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. Picture taken April 10, 2021. REUTERS/Alkis Konstantinidis

A view of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. Picture taken April 10, 2021. REUTERS/Alkis Konstantinidis

An aerial view of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. Picture taken April 10, 2021. Picture taken with a drone. REUTERS/Alkis Konstantinidis

A view of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. Picture taken April 10, 2021. REUTERS/Alkis Konstantinidis

A woman walks outside Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. Picture taken April 10, 2021. REUTERS/Alkis Konstantinidis

A teacher checks students' rapid test results as schools reopen following the easing of measures against the spread of the coronavirus disease (COVID-19), in the suburb of Glyfada, Athens, Greece, April 12, 2021. REUTERS/Costas Baltas

Students wearing protective face masks sit inside a classroom as schools reopen following the easing of measures against the spread of the coronavirus disease (COVID-19), in the suburb of Glyfada, Athens, Greece, April 12, 2021. REUTERS/Costas Baltas

A student undergoes a temperature check as schools reopen following the easing of measures against the spread of the coronavirus disease (COVID-19), in the suburb of Glyfada, Athens, Greece, April 12, 2021. REUTERS/Costas Baltas

Students wearing protective face masks sit inside a classroom as schools reopen following the easing of measures against the spread of the coronavirus disease (COVID-19), in the suburb of Glyfada, Athens, Greece, April 12, 2021. REUTERS/Costas Baltas

Students sit inside a classroom as schools reopen following the easing of measures against the spread of the coronavirus disease (COVID-19), in the suburb of Glyfada, Athens, Greece, April 12, 2021. REUTERS/Costas Baltas

A student wearing a protective face mask sits inside a classroom as schools reopen following the easing of measures against the spread of the coronavirus disease (COVID-19), in the suburb of Glyfada, Athens, Greece, April 12, 2021. REUTERS/Costas Baltas

Students wearing protective face masks sit inside a classroom as schools reopen following the easing of measures against the spread of the coronavirus disease (COVID-19), in the suburb of Glyfada, Athens, Greece, April 12, 2021. REUTERS/Costas Baltas

A youth wearing a protective mask plays with a ball on an empty square, next to a statue of Greek politician and prime minister Georgios Theotokis, amid the coronavirus disease (COVID-19) pandemic, on the island of Corfu, Greece, April 11, 2021. REUTERS/Alkis Konstantinidis

The church of Saint George where Britain's Prince Philip, husband of Queen Elizabeth, was baptized, on the island of Corfu, Greece, April 11, 2021. REUTERS/Alkis Konstantinidis

Flowers are seen outside Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. REUTERS/Alkis Konstantinidis

A sign is seen at the entrance of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. REUTERS/Alkis Konstantinidis

Lynn Marshall lays flowers outside Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. REUTERS/Alkis Konstantinidis

A man closes the entrance of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. REUTERS/Alkis Konstantinidis

A family walks past Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. REUTERS/Alkis Konstantinidis

Flowers are laid outside the premises of Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. REUTERS/Alkis Konstantinidis

A girl and her dog walk outside Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. REUTERS/Alkis Konstantinidis

People walk past Mon Repos, a 19th century neoclassical villa in which Britain's Prince Philip, husband of Queen Elizabeth, was born and currently accommodates an archaeological museum, on the island of Corfu, Greece, April 10, 2021. REUTERS/Alkis Konstantinidis