Italy's President Sergio Mattarella looks on as he attends La Scala's opening of its 2022-23 season with a performance of "Boris Godunov," a Russian-composed opera performed by Russian artists, in Milan, Italy, December 7, 2022. REUTERS/Flavio Lo Scalzo 

Italy's President Sergio Mattarella looks on as he attends La Scala's opening of its 2022-23 season with a performance of "Boris Godunov," a Russian-composed opera performed by Russian artists, in Milan, Italy, December 7, 2022. REUTERS/Flavio Lo Scalzo 

Prime Minister Boris Johnson is greeted by Italian President Sergio Mattarella as he arrives to attend a reception and dinner at The Quirinale Palace in Rome, Italy, October 30, 2021. Picture taken October 30, 2021. Aaron Chown/Pool via REUTERS 

Prime Minister Boris Johnson is greeted by Italian President Sergio Mattarella and Italian Prime Minister Mario Draghi, as he arrives to attend a reception and dinner at The Quirinale Palace in Rome, Italy, October 30, 2021. Picture taken October 30, 2021. Aaron Chown/Pool via REUTERS 

Prime Minister Boris Johnson is greeted by Italian President Sergio Mattarella, his daughter Laura Mattarella, Italian Prime Minister Mario Draghi and his wife Maria Serena Cappello, as he arrives at the reception and dinner at The Quirinal Palace in Rome, Italy, October 30, 2021. Picture taken October 30, 2021. Aaron Chown/Pool via REUTERS 

Oxfam activists wear full head masks depicting Britain's Prime Minister Boris Johnson, German Chancellor Angela Merkel, French President Emmanuel Macron, Canada's Prime Minister Justin Trudeau and U.S. President Donald Trump as they protest at the venue for U.N. Climate Change Conference (COP25) in Madrid, Spain, December 10, 2019. REUTERS/Sergio Perez 

Oxfam activists wear full head masks depicting Britain's Prime Minister Boris Johnson, German Chancellor Angela Merkel, French President Emmanuel Macron, Canada's Prime Minister Justin Trudeau and U.S. President Donald Trump as they protest at the venue for U.N. Climate Change Conference (COP25) in Madrid, Spain, December 10, 2019. REUTERS/Sergio Perez 

Oxfam activists wear full head masks depicting Britain's Prime Minister Boris Johnson, German Chancellor Angela Merkel, French President Emmanuel Macron, Canada's Prime Minister Justin Trudeau and U.S. President Donald Trump as they protest at the venue for U.N. Climate Change Conference (COP25) in Madrid, Spain, December 10, 2019. REUTERS/Sergio Perez 

Tennis - Davis Cup Finals - Quarter-Final - Caja Magica, Madrid, Spain - November 22, 2019 Germany's Boris Becker reacts during Jan-Lennard Struff match against Britain's Dan Evans REUTERS/Sergio Perez 

Tennis - Davis Cup Finals - Quarter-Final - Caja Magica, Madrid, Spain - November 22, 2019 Germany's Boris Becker reacts during Jan-Lennard Struff match against Britain's Dan Evans REUTERS/Sergio Perez 

Italian President Sergio Mattarella gives a speech at a farewell event for ECB's outgoing President Mario Draghi in Frankfurt, Germany October 28, 2019. Boris Roessler/Pool via REUTERS 

Formula One F1 - Monaco Grand Prix - Circuit de Monaco, Monte Carlo, Monaco - May 27, 2018 Force India's Sergio Perez makes a pit stop during the race Boris Horvat/Pool via REUTERS 

Tennis - WTA Mandatory - Madrid Open - Madrid, Spain - May 12, 2018 Former Tennis players Boris Becker and Manuel Santana in the stands during the final between Czech Republic's Petra Kvitova and Netherlands' Kiki Bertens REUTERS/Sergio Perez 

Barcelona's Andres Iniesta holds the trophy as his team mates Pedro Rodriguez (L) and Sergio Busquets pass by during the celebrations for the victory over Sevilla in the UEFA Super Cup soccer match at Boris Paichadze Dinamo Arena in Tbilisi, Georgia, August 12, 2015. REUTERS/David Mdzinarishvili 

France's Boris Diaw (L) is challenged by Serbia's Nemanja Bjelica during their Basketball World Cup semi-final game in Madrid September 12, 2014. REUTERS/Sergio Perez (SPAIN - Tags: SPORT BASKETBALL) 

Spain's Sergio Llull (L) goes up for a basket past France's Boris Diaw during their Basketball World Cup quarter-final game in Madrid September 10, 2014. REUTERS/Juan Medina (SPAIN - Tags: SPORT BASKETBALL) 

Spain's Sergio Llull (L) goes up for a basket past France's Boris Diaw during their Basketball World Cup quarter-final game in Madrid September 10, 2014. REUTERS/Juan Medina (SPAIN - Tags: SPORT BASKETBALL) 

France's Boris Diaw (L) passes the ball around Spain's Rudy Fernandez during their Basketball World Cup quarter-final game in Madrid September 10, 2014. REUTERS/Sergio Perez (SPAIN - Tags: SPORT BASKETBALL) 

France's Boris Diaw (R) and Spain's Ricky Rubio battle for the ball during their Basketball World Cup quarter-final game in Madrid September 10, 2014. REUTERS/Sergio Perez (SPAIN - Tags: SPORT BASKETBALL) 

Spain's Serge Ibaka (R) goes up for a basket over France's Boris Diaw during their Basketball World Cup quarter-final game in Madrid September 10, 2014. REUTERS/Sergio Perez (SPAIN - Tags: SPORT BASKETBALL) 

Spain's Serge Ibaka (R) goes up for a basket over France's Boris Diaw during their Basketball World Cup quarter-final game in Madrid September 10, 2014. REUTERS/Sergio Perez (SPAIN - Tags: SPORT BASKETBALL) 

Spain's (L-R) Xabi Alonso, Sergio Ramos and Jordi Alba wait until Georgia's goalkeeper Georgia's Giorgi Loria is carried off on a stretcher during their 2014 World Cup qualifying soccer match at Boris Paichadze Stadium in Tbilisi September 11, 2012. REUTERS/David Mdzinarishvili (GEORGIA - Tags: SPORT SOCCER) 

Georgia's Levan Mchedlidze (R) goes for a header with Spain's Sergio Busquets during their 2014 World Cup qualifying soccer match at Boris Paichadze Stadium in Tbilisi September 11, 2012. REUTERS/David Mdzinarishvili (GEORGIA - Tags: SPORT SOCCER) 

Spain's Sergio Busquets (R) tackles Georgia's Jaba Kankava during their 2014 World Cup qualifying soccer match at Boris Paichadze Stadium in Tbilisi September 11, 2012. REUTERS/David Mdzinarishvili (GEORGIA - Tags: SPORT SOCCER) 

Rio de Janeiro mayor Eduardo Paes (R) holds the Olympic flag next to International Olympic Committee President Jacques Rogge (C) and London mayor Boris Johnson during the closing ceremony of the London 2012 Olympic Games at the Olympic Stadium August 12, 2012. REUTERS/Sergio Moraes (BRITAIN - Tags: OLYMPICS SPORT)

London mayor Boris Johnson (L) holds the Olympic flag next to International Olympic Committee President Jacques Rogge (C) and Rio de Janeiro mayor Eduardo Paes during the closing ceremony of the London 2012 Olympic Games at the Olympic Stadium August 12, 2012. REUTERS/Sergio Moraes (BRITAIN - Tags: OLYMPICS SPORT)

International Olympic Committee President Jacques Rogge (C) holds the Olympic flag next to London mayor Boris Johnson (L) and Rio de Janeiro mayor Eduardo Paes during the closing ceremony of the London 2012 Olympic Games at the Olympic Stadium August 12, 2012. REUTERS/Sergio Moraes (BRITAIN - Tags: OLYMPICS SPORT)

Serbia's Filip Filipovic (above) shoots as Montenegro's Boris Zlokovic (L) and Vladimir Gojkovic (R) defend in their men's bronze medal water polo match during the London 2012 Olympic Games August 12, 2012. REUTERS/Sergio Moraes (BRITAIN - Tags: OLYMPICS SPORT WATER POLO)

France's Boris Diaw (L) is guarded by Nigeria's Olumide Oyedeji during their men's preliminary round Group A basketball match at the Basketball Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Sergio Perez (BRITAIN - Tags: OLYMPICS SPORT BASKETBALL) 

France's Boris Diaw (L) is guarded by Nigeria's Olumide Oyedeji during their men's preliminary round Group A basketball match at the Basketball Arena during the London 2012 Olympic Games August 6, 2012. REUTERS/Sergio Perez (BRITAIN - Tags: OLYMPICS SPORT BASKETBALL)

France's Boris Diaw (L) goes to the basket against Lithuania's Linas Kleiza during their men's preliminary round Group A basketball match at the Basketball Arena during the London 2012 Olympic Games August 2, 2012. REUTERS/Sergio Perez (BRITAIN - Tags: SPORT OLYMPICS SPORT BASKETBALL)

France's Boris Diaw (C) tries to get past Lithuania's Linas Kleiza (L) and Lithuania's Jonas Valanciunas during their men's preliminary round Group A basketball match at the Basketball Arena during the London 2012 Olympic Games August 2, 2012. REUTERS/Sergio Perez (BRITAIN - Tags: SPORT OLYMPICS SPORT BASKETBALL)

France's Boris Diaw goes past Lithuania's Linas Kleiza during their men's preliminary round Group A basketball match at the Basketball Arena during the London 2012 Olympic Games August 2, 2012. REUTERS/Sergio Perez (BRITAIN - Tags: SPORT OLYMPICS SPORT BASKETBALL)

Russia's head coach Boris Sokolovskiy instructs players during their Women's preliminary round group B basketball match against Great Britain at the Basketball Arena during the London 2012 Olympic Games August 1, 2012. REUTERS/Sergio Perez (BRITAIN - Tags: OLYMPICS SPORT BASKETBALL)

France's Boris Diaw (R) grabs the rebound from Argentina's Luis Scola during their men's preliminary round Group A basketball match at the Basketball Arena during the London 2012 Olympic Games July 31, 2012. REUTERS/Sergio Perez (BRITAIN - Tags: OLYMPICS SPORT BASKETBALL)

Lebron James (C) of the U.S. shoots over France's Florent Pietrus (L) as France's Boris Diaw (R) looks on during their men's Group A basketball match at the London 2012 Olympic Games in the Basketball arena July 29, 2012. REUTERS/Sergio Perez (BRITAIN - Tags: OLYMPICS SPORT BASKETBALL)

Kevin Durant (C) of the U.S goes to the basket past France's Nicolas Batum (L) and Boris Diaw during their men's Group A basketball match at the London 2012 Olympic Games in the Basketball arena July 29, 2012. REUTERS/Sergio Perez (BRITAIN - Tags: OLYMPICS SPORT BASKETBALL)

Russia's coach Boris Sokolovskiy gestures during the women's Group B basketball match against Canada at the London 2012 Olympic Games in the Basketball arena July 28, 2012. REUTERS/Sergio Perez (BRITAIN - Tags: SPORT BASKETBALL SPORT OLYMPICS)

Fiat-Chrysler CEO Sergio Marchionne (R) answers reporters' questions next to Serbia's President Boris Tadic (2nd L) after the unveiling of the new Fiat 500L on the first media day of the Geneva Auto Show at the Palexpo in Geneva March 6, 2012. Marchionne said the Italian carmaker was open to all potential partnerships, even the newly formed tie-up between PSA Peugeot Citroen and General Motors. The Fiat 500L car will be produced in Serbia. The Geneva Auto Show will take place from March 8 to 18, 2012. REUTERS/Denis Balibouse (SWITZERLAND - Tags: TRANSPORT BUSINESS POLITICS) 

France's Boris Diaw (L) drives on New Zealand's Mika Vukona during their FIBA Basketball World Championship game in Izmir September 2, 2010. REUTERS/Sergio Perez (TURKEY - Tags: SPORT BASKETBALL) 

France's Boris Diaw (L) tries to get past New Zealand's Mika Vukona in the first quarter of their FIBA Basketball World Championship game in Izmir September 2, 2010. REUTERS/Sergio Perez (TURKEY - Tags: SPORT BASKETBALL) 

Mantas Kalnietis (L) of Lithuania drives on Boris Diaw of France during their FIBA Basketball World Championship game in Izmir September 1, 2010. REUTERS/Sergio Perez (TURKEY - Tags: SPORT BASKETBALL) 

Boris Diaw (L) of France drives on Linas Kleiza of Lithuania during their FIBA Basketball World Championship game in Izmir September 1, 2010. REUTERS/Sergio Perez (TURKEY - Tags: SPORT BASKETBALL) 

Linas Kleiza (R) of Lithuania drives on Boris Diaw of France during their FIBA Basketball World Championship game in Izmir September 1, 2010. REUTERS/Sergio Perez (TURKEY - Tags: SPORT BASKETBALL) 

Spain's Marc Gasol (L) gets tangled up with France's Boris Diaw during their FIBA Basketball World Championship game in Izmir August 28, 2010. REUTERS/Sergio Perez (TURKEY - Tags: SPORT BASKETBALL) 

France's Boris Diaw sticks out his tongue as he attends a media meeting at the team's hotel in Izmir August 27, 2010. France will compete at the Basketball World Championships, which will be held in Turkey from August 28 to September 12. REUTERS/Sergio Perez (TURKEY - Tags: SPORT BASKETBALL) 

Serbia's President Boris Tadic (R) gestures beside Italian Minister of Foreign Affairs Franco Frattini (C) and Sergio Marchionne, CEO of FIAT Group, during the signing a definitive agreement for the formation of a billion-dollar joint venture between Serbia and FIAT in Belgrade September 29, 2008. REUTERS/Ivan Milutinovic (SERBIA) 

Serbia's President Boris Tadic (C), Italian Minister of Foreign Affairs Franco Frattini (R) and Sergio Marchionne CEO of FIAT Group give statements to media after signing a definitive agreement for the formation of a billion-dollar joint venture between Serbia and FIAT in Belgrade September 29, 2008. REUTERS/Ivan Milutinovic (SERBIA) 

Barcelona's Lionel Messi (R) and Numancia's Sergio Boris fight for the ball during their Spanish First Division Soccer League match at Los Pajaritos stadium in Soria, August 31, 2008. REUTERS/Ricardo Ordonez (SPAIN) 

Barcelona's Samuel Eto'o (L) and Numancia's Sergio Boris fight for the ball during their Spanish First Division Soccer League match at Los Pajaritos stadium in Soria August 31, 2008. REUTERS/Ricardo Ordonez (SPAIN) 

France's Tony Parker (R) looks down in front of team mate Boris Diaw after losing their European Championships first round basketball game against Slovenia in Alicante September 5, 2007. REUTERS/Sergio Perez (SPAIN) 

Slovenia's Radoslav Nesterovic (L) goes up for a basket past France's Boris Diaw during their European Basketball Championships first round game in Alicante September 5, 2007. REUTERS/Sergio Perez (SPAIN) 

Slovenia's Goran Jagodnik (R) tries to block France's Boris Diaw during their first round game at the European Basketball Championships in Alicante September 5 , 2007. REUTERS/Sergio Perez (SPAIN) 

France's Boris Diaw dunks during the first round European Basketball Championships game against Italy in Alicante September 4 , 2007. REUTERS/Sergio Perez (SPAIN) 

France's Boris Diaw (L) goes for a basket past Italy's Andrea Bagnani during their first round game at the European Basketball Championships in Alicante September 4 , 2007. REUTERS/Sergio Perez (SPAIN) 

France's national basketball team players and technical staff pose for an official picture before their first round game against Poland at the European Basketball Championships in Alicante September 3, 2007. Bottom row, L-R: Yohann Sangare, Joseph Gomis, Cedric Ferchaud, Tarik Kirksay,Yakhouba Diawara, Tony Parker and Sanya Giffa. Top row, 3rd L- 3rd R: Boris Diaw, Pape Badiane, Frederic Weis, Ronnu Turiaf and Florient Petrus. Coach Claude Bergeaud is at right. REUTERS/Sergio Perez (SPAIN) 

France's Boris Diaw (L) is grabbed by his team mate Mamoutou Diarra during a practice ahead of his team's quarter-final round game against Greece at the world basketball championships in Saitama August 28, 2006. REUTERS/Sergio Perez (JAPAN) 

France's Ronny Turiaf (L) catches a ball next to team mate Boris Diaw during a practice ahead of their quarter-final round game against Greece at the world basketball championships in Saitama August 28, 2006. REUTERS/Sergio Perez (JAPAN) 

France's Boris Diaw-Riffiod shoots during a team practice at the World Basketball Championships in Saitama August 25, 2006. REUTERS/Sergio Perez (JAPAN) 

Jorge Moragas, Spanish parliamentarian and Popular Party's foreign policy chief, attends a news conference at party's headquarters in Madrid October 16, 2004. [Cuba barred entry to Moragas and two Dutch legislators, Boris Dittich and Katheleen Ferrier, on a trip to support Cuban dissidents, setting back Spain's campaing to mend ties between Europe and the communist-ruled island.]