A man attends the celebrations of Victory Day, which marks the anniversary of the victory over Nazi Germany in World War Two, in Sofia, Bulgaria, May 9, 2021. REUTERS/Spasiyana Sergieva

A woman holds Russian flag, as she attends the celebrations of Victory Day, which marks the anniversary of the victory over Nazi Germany in World War Two, in Sofia, Bulgaria, May 9, 2021. REUTERS/Spasiyana Sergieva

People attend the celebrations of Victory Day, which marks the anniversary of the victory over Nazi Germany in World War Two, in Sofia, Bulgaria, May 9, 2021. REUTERS/Spasiyana Sergieva

A World War Two veteran attends the celebrations of Victory Day, which marks the anniversary of the victory over Nazi Germany, in Sofia, Bulgaria, May 9, 2021. REUTERS/Spasiyana Sergieva

Bulgarian President Rumen Radev looks on before making a statement announcing parliamentary snap election, in Sofia, Bulgaria, May 5, 2021. REUTERS/Stoyan Nenov

Bulgarian President Rumen Radev makes a statement announcing parliamentary snap election, in Sofia, Bulgaria, May 5, 2021. REUTERS/Stoyan Nenov

Bulgarian President Rumen Radev makes a statement announcing a parliamentary snap election, in Sofia, Bulgaria, May 5, 2021. REUTERS/Stoyan Nenov

Bulgarian President Rumen Radev gives a mandate to form a new government to former Bulgarian foreign minister Daniel Mitov of centre-right GERB party in Sofia, Bulgaria, April 20, 2021. REUTERS/Stoyan Nenov

Bulgarian President Rumen Radev gives a mandate to form a new government to former Bulgarian foreign minister Daniel Mitov of centre-right GERB party in Sofia, Bulgaria, April 20, 2021. REUTERS/Stoyan Nenov

Bulgarian President Rumen Radev takes off his mask before delivering his speech at the first plenary session of the new parliament in Sofia, Bulgaria, April 15, 2021. REUTERS/Stoyan Nenov

A Bulgarian Muslim man carries his son on a horse as they attend a ritual ahead of a mass circumcision ceremony in the village of Ribnovo, Bulgaria, April 11, 2021. REUTERS/Stoyan Nenov

A Bulgarian Muslim man carries his son on a horse as they attend a ritual ahead of a mass circumcision ceremony in the village of Ribnovo, Bulgaria, April 11, 2021. REUTERS/Stoyan Nenov

A Bulgarian Muslim man leads his horse as he attends a ritual ahead of a mass circumcision ceremony in the village of Ribnovo, Bulgaria, April 11, 2021. REUTERS/Stoyan Nenov

Bulgarian Muslim oil wrestlers attend a ritual ahead of a mass circumcision ceremony in the village of Ribnovo, Bulgaria, April 11, 2021. REUTERS/Stoyan Nenov TPX IMAGES OF THE DAY

A Bulgarian Muslim man carries his son on a horse as they attend a ritual ahead of a mass circumcision ceremony in the village of Ribnovo, Bulgaria, April 11, 2021. REUTERS/Stoyan Nenov

Kornelia Ninova, Bulgarian Socialist Party leader, votes in a polling station during the parliamentary election in Sofia, Bulgaria, April 4, 2021. REUTERS/Spasiyana Sergieva

Kornelia Ninova, Bulgarian Socialist Party leader, votes in a polling station during the parliamentary election in Sofia, Bulgaria, April 4, 2021. REUTERS/Spasiyana Sergieva

Kornelia Ninova, Bulgarian Socialist Party leader, leaves after voting in a polling station during the parliamentary election in Sofia, Bulgaria, April 4, 2021. REUTERS/Spasiyana Sergieva

Kornelia Ninova, Bulgarian Socialist Party leader, speaks to the media after voting in a polling station during the parliamentary election in Sofia, Bulgaria, April 4, 2021. REUTERS/Spasiyana Sergieva

Kornelia Ninova, Bulgarian Socialist Party leader, votes in a polling station during the parliamentary election in Sofia, Bulgaria, April 4, 2021. REUTERS/Spasiyana Sergieva

Kornelia Ninova, Bulgarian Socialist Party leader, votes in a polling station during the parliamentary election in Sofia, Bulgaria, April 4, 2021. REUTERS/Spasiyana Sergieva

A man walks past a billboard with an election poster of the Bulgarian Socialist Party leader Kornelia Ninova in Sofia, Bulgaria, March 31, 2021. Picture taken March 31, 2021. REUTERS/Spasiyana Sergieva

A car is parked near election posters of the ruling centre-right GERB party and the opposition Bulgarian Socialist Party, in the village of Vinogradets, Bulgaria, March 28, 2021. Picture taken March 28, 2021. REUTERS/Stoyan Nenov

A man cycles past election posters of Boyko Borissov, Bulgarian Prime Minister and leader of centre-right GERB party in Bankya, near Sofia, Bulgaria, March 31, 2021. Picture taken March 31, 2021. REUTERS/Spasiyana Sergieva

A man walks past a wall with election posters of the ruling centre-right GERB party and the opposition Bulgarian Socialist Party, in the village of Vinogradets, Bulgaria, March 28, 2021. Picture taken March 28, 2021. REUTERS/Stoyan Nenov

A street cleaner carries a broom near election posters of Boyko Borissov, Bulgarian Prime Minister and leader of centre-right GERB party in Bankya, near Sofia, Bulgaria, March 31, 2021. Picture taken March 31, 2021. REUTERS/Spasiyana Sergieva

Austria's Chancellor Sebastian Kurz is seen on a screen during a video conference meeting with European Council President and Croatian, Bulgarian, Latvian and Slovenian Prime Ministers at the EU headquarters in Brussels, Belgium March 17, 2021. John Thys/Pool via REUTERS

Austria's Chancellor Sebastian Kurz is seen on a screen during a video conference meeting with European Council President and Croatian, Bulgarian, Latvian and Slovenian Prime Ministers at the EU headquarters in Brussels, Belgium March 17, 2021. John Thys/Pool via REUTERS

Austria's Chancellor Sebastian Kurz is seen on a screen during a video conference meeting with European Council President and Croatian, Bulgarian, Latvian and Slovenian Prime Ministers at the EU headquarters in Brussels, Belgium March 17, 2021. John Thys/Pool via REUTERS

European Council President Charles Michel arrives for a video conference meeting with Austria's Chancellor and Croatian, Bulgarian, Latvian and Slovenian Prime Ministers at the EU headquarters in Brussels, Belgium March 17, 2021. John Thys/Pool via REUTERS

European Council President Charles Michel arrives for a video conference meeting with Austria's Chancellor and Croatian, Bulgarian, Latvian and Slovenian Prime Ministers at the EU headquarters in Brussels, Belgium March 17, 2021. John Thys/Pool via REUTERS

European Council President Charles Michel arrives for a video conference meeting with Austria's Chancellor and Croatian, Bulgarian, Latvian and Slovenian Prime Ministers at the EU headquarters in Brussels, Belgium March 17, 2021. John Thys/Pool via REUTERS

European Council President Charles Michel arrives for a video conference meeting with Austria's Chancellor and Croatian, Bulgarian, Latvian and Slovenian Prime Ministers at the EU headquarters in Brussels, Belgium March 17, 2021. John Thys/Pool via REUTERS

People take part in a torch ceremony, organised in commemoration of late General Hristo Lukov, who led the nationalist Union of Bulgarian National Legions in the 1930s and early 1940s, in Sofia, Bulgaria, February 13, 2021. REUTERS/Stoyan Nenov

People take part in a torch ceremony, organised in commemoration of late General Hristo Lukov, who led the nationalist Union of Bulgarian National Legions in the 1930s and early 1940s, in Sofia, Bulgaria, February 13, 2021. REUTERS/Stoyan Nenov

People take part in a torch ceremony, organised in commemoration of late General Hristo Lukov, who led the nationalist Union of Bulgarian National Legions in the 1930s and early 1940s, in Sofia, Bulgaria, February 13, 2021. REUTERS/Stoyan Nenov

Bulgarian Health MinisterKostadin Angelov receives the second shot of the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine at Alexandrovska Hospital in Sofia, Bulgaria, January 18, 2021. REUTERS/Stoyan Nenov

Bulgarian Health Minister Kostadin Angelov receives the second shot of the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine at Alexandrovska Hospital in Sofia, Bulgaria, January 18, 2021. REUTERS/Stoyan Nenov

Bulgarian Health Minister Kostadin Angelov receives the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine at Saint Anna hospital in Sofia, Bulgaria, December 27, 2020. REUTERS/Stoyan Nenov

Bulgarian Health Minister Kostadin Angelov watches an Orthodox priest receiving the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine at Saint Anna hospital in Sofia, Bulgaria, December 27, 2020. REUTERS/Stoyan Nenov TPX IMAGES OF THE DAY

Bulgarian Health Minister Kostadin Angelov receives the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine at Saint Anna hospital in Sofia, Bulgaria, December 27, 2020. REUTERS/Stoyan Nenov

Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, is embraced by his friend Chilean street skateboarder Cata Diaz, 21, before they do tricks, in front of MACBA (Barcelona Contemporary Art Museum), amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain November 17, 2020. Picture taken November 17, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 24, wearing a face mask holds his skate as he crosses a street, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain October 3, 2020. Picture taken October 3, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 24, skates on a street in the Raval district, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain September 9, 2020. Picture taken September 9, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 24, stands with his skate as police officers arrive at MACBA (Barcelona Contemporary Art Museum), amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain October 12, 2020.Picture taken October 12, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, wearing a face mask gestures on a street next to his house in the Raval district, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain November 11, 2020. Picture taken November 11, 2020. REUTERS/Nacho Doce

Bulgarian skateboarder Petar "Stewie" Stantchev, 25, does a trick, known as a frontside ollie, in front of Barcelona Contemporary Art Museum (MACBA) in Barcelona, Spain November 11, 2020. Picture taken November 11, 2020. REUTERS/Nacho Doce TPX IMAGES OF THE DAY

Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, is pictured with his tattoos as he rests at the kitchen table inside his house, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain November 17, 2020. Picture taken November 17, 2020. REUTERS/Nacho Doce

Bulgarian skateboarder Petar "Stewie" Stantchev, 25, does a trick, known as a backside heelflip, on a street in the Barceloneta district in Barcelona, Spain November 3, 2020. Picture taken November 3, 2020. REUTERS/Nacho Doce

A homeless man sleeps next to Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, and another skaters before they do tricks, in front of MACBA (Barcelona Contemporary Art Museum), amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain November 18, 2020. Picture taken November 18, 2020. REUTERS/Nacho Doce

Bulgarian skateboarder Petar "Stewie" Stantchev, 24, does a trick, known as a nollie 360 flip, in front of Barcelona Contemporary Art Museum in Barcelona, Spain October 11, 2020. Picture taken October 11, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, celebrates his his birthday with his friends, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain October 16, 2020. Picture taken October 16, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, and his mates prepare to do tricks, in front of MACBA (Barcelona Contemporary Art Museum), amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain November 18, 2020. Picture taken November 18, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, does a trick, known as a nollie shuvit, in front of Barcelona Contemporary Art Museum in Barcelona, Spain November 17, 2020. Picture taken November 17, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, drinks coffee next to his Pablo Perez, a fellow skateboarder, inside his house, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain November 17, 2020. Picture taken November 17, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 24, stretches inside his home, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain October 3, 2020. Picture taken October 3, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 24, wearing a face mask holds his skate as he talks with friends on Las Ramblas street, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain October 3, 2020. Picture taken October 3, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, wearing a face mask buys vegetables and fruits near his house in the Raval district, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain November 16, 2020. Picture taken November 16, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, stretches inside his home, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain December 12, 2020. REUTERS/Nacho Doce

Bulgarian street skateboarder Petar "Stewie" Stantchev, 25, wearing a face mask as he takes the subway, amid the coronavirus disease (COVID-19) outbreak, in Barcelona, Spain November 16, 2020. Picture taken November 16, 2020. REUTERS/Nacho Doce