Actors perform during the opening ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Mladen ANTONOV /

A general view during the opening ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Mladen ANTONOV /

Russian model Natalia Vodianova (R) and Spanish goalkeeper Iker Casillas stand next to the World Cup trophy during the opening ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Mladen ANTONOV /

Actors perform during the opening ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Mladen ANTONOV /

British singer Robbie Williams performs during the opening ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Mladen ANTONOV /

A performer juggles with 3 footballs during the Opening Ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Kirill KUDRYAVTSEV /

Actors perform during the Opening Ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Mladen ANTONOV /

English singer Robbie Williams (C) performs during the Opening Ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Kirill KUDRYAVTSEV /

Actors perform during the opening ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Mladen ANTONOV /

Russian Prime Minister Dmitry Medvedev (L) shakes hands with Rwanda's President Paul Kagame as French former president Nicolas Sarkozy stands nearby before the opening ceremony prior to the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / SPUTNIK / Dmitry ASTAKHOV

Former Brazilian international player Ronaldo (R) attends the opening ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Juan Mabromata /

Brazilian football ledgend Ronaldo waves during the Opening Ceremony before the the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Alexander NEMENOV /

English singer Robbie Williams performs during the opening ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Alexander NEMENOV /

People watch the opening ceremony ahead of the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia in the fan zone near the main building of the Moscow State University in Moscow on June 14, 2018. / AFP PHOTO / Maxim ZMEYEV

English singer Robbie Williams (L) and Russian soprano Aida Garifullina perform during the Opening Ceremony before the Russia 2018 World Cup Group A football match between Russia and Saudi Arabia at the Luzhniki Stadium in Moscow on June 14, 2018. / AFP PHOTO / Mladen ANTONOV /