Silvio Berlusconi, former Italian prime minister and leader of Forza Italia party, prepares to cast his ballot at a polling station in Milan, Italy, May 26, 2019. The European Parliament (EP) elections started in Italy on Sunday. (Xinhua/Alberto Lingria)

Silvio Berlusconi, former Italian prime minister and leader of Forza Italia party, is registered for voting at a polling station in Milan, Italy, May 26, 2019. The European Parliament (EP) elections started in Italy on Sunday. (Xinhua/Alberto Lingria)

A voter casts ballot at a polling station in Athens, Greece on May 26, 2019. Voters in Greece cast their ballots on Sunday in elections to the European Parliament (EP). (Xinhua/Marios Lolos)

A man votes at a polling station in Athens, Greece on May 26, 2019. Voters in Greece cast their ballots on Sunday in elections to the European Parliament (EP). (Xinhua/Marios Lolos)

A woman votes at a polling station in Athens, Greece on May 26, 2019. Voters in Greece cast their ballots on Sunday in elections to the European Parliament (EP). (Xinhua/Marios Lolos)

Voters wait at a polling station in Athens, Greece on May 26, 2019. Voters in Greece cast their ballots on Sunday in elections to the European Parliament (EP). (Xinhua/Marios Lolos)

Greek main opposition New Democracy party leader Kyriakos Mitsotakis (L) is seen at a polling station in Athens, Greece on May 26, 2019. Voters in Greece cast their ballots on Sunday in elections to the European Parliament (EP). (Xinhua/Michalis Karagiannis)

Greek Prime Minister Alexis Tsipras votes at a polling station in Athens, Greece on May 26, 2019. Voters in Greece cast their ballots on Sunday in elections to the European Parliament (EP). (Xinhua/Marios Lolos)

Greek main opposition New Democracy party leader Kyriakos Mitsotakis casts his vote in Athens, Greece on May 26, 2019. Voters in Greece cast their ballots on Sunday in elections to the European Parliament (EP). (Xinhua/Michalis Karagiannis)

Greek Prime Minister Alexis Tsipras is seen at a polling station in Athens, Greece on May 26, 2019. Voters in Greece cast their ballots on Sunday in elections to the European Parliament (EP). (Xinhua/Marios Lolos)

Greek Prime Minister Alexis Tsipras is seen at a polling station in Athens, Greece on May 26, 2019. Voters in Greece cast their ballots on Sunday in elections to the European Parliament (EP). (Xinhua/Marios Lolos)

Croatian President Kolinda Grabar-Kitarovic casts her vote at a polling station in Zagreb, Croatia, May 26, 2019. The European Parliament elections started in Croatia on Sunday. (Xinhua/Patrik Macek)

Croatian President Kolinda Grabar-Kitarovic casts her vote at a polling station in Zagreb, Croatia, May 26, 2019. The European Parliament elections started in Croatia on Sunday. (Xinhua/Patrik Macek)

A woman casts her vote at a polling station in Zagreb, Croatia, May 26, 2019. The European Parliament elections started in Croatia on Sunday. (Xinhua/Marin Tironi)