People queue to cast their votes in a series of referendums in front of a ballot station at the Stadthaus administration building in Zurich, Switzerland June 13, 2021. REUTERS/Arnd Wiegmann

People queue to cast their votes in a series of referendums in front of a ballot station at the Stadthaus administration building in Zurich, Switzerland June 13, 2021. REUTERS/Arnd Wiegmann

A woman throws an envelope into a box as people queue to cast their votes in a series of referendums in front of a ballot station at the Stadthaus administration building in Zurich, Switzerland June 13, 2021. REUTERS/Arnd Wiegmann

A woman throws an envelope into a box as people queue to cast their votes in a series of referendums in front of a ballot station at the Stadthaus administration building in Zurich, Switzerland June 13, 2021. REUTERS/Arnd Wiegmann

A woman throws an envelope into a box as people queue to cast their votes in a series of referendums in front of a ballot station at the Stadthaus administration building in Zurich, Switzerland June 13, 2021. REUTERS/Arnd Wiegmann

People watch the UEFA EURO 2020 Turkey vs Italy opening match in front of Le Calvados -Bar Sportive- in Zurich, Switzerland June 11, 2021. REUTERS/Arnd Wiegmann

People watch the UEFA EURO 2020 Turkey vs Italy opening match in front of Salvi's Bar in Zurich, Switzerland June 11, 2021. REUTERS/Arnd Wiegmann

People watch the UEFA EURO 2020 Turkey vs Italy opening match in front of Salvi's Bar in Zurich, Switzerland June 11, 2021. REUTERS/Arnd Wiegmann

The Jet d'Eau fountain is seen behind Swiss army radar station ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

A police van is seen outside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

A police officer checks a car with a search dog ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

A police officer walks with a search dog ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

General view outside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

General view of a room inside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

A painter adds finishing touches to ornaments inside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

A painter adds finishing touches to ornaments inside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Two chairs stand inside the library of Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

General view inside the library of Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

General view inside the library of Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Swiss army's Pierre-Yves Eberle and Yvon Langel along with police officials, Francois Waridel, Stephane Theimer and Monica Bonfanti, hold a news conference outside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

A tent is set up outside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Vice Director of Swiss Federal Police Stephane Theimer speaks at a news conference outside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Swiss army helicopter patrols above Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Geneva police chief Monica Bonfanti attends a news conference outside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Swiss army radar station standing near Villa La Grange, with Saint Peter's Cathedral in the back, is seen ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Police officers stand near the fence outside Hotel Restaurant du Parc des Eaux-Vives ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Members of civil protection check the fence outside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Swiss army radar station is seen near Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Workers labour outside Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

People take photos of Swiss army radar station near Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

Swiss army radar station is seen near Villa La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 11, 2021. REUTERS/Denis Balibouse

French bull terrier Chouchou enjoys a bath in a public fountain at the Paradeplatz square in Zurich Switzerland, June 10, 2021. REUTERS/Arnd Wiegmann

The Hotel Restaurant des Aux-Vives is pictured in the Eaux-Vives Parc next to La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin in Geneva, Switzerland, June 8, 2021. Picture taken with a drone June 8, 2021. REUTERS/Denis Balibouse

The Villa La Grange is pictured with the Jet d'Eau (water fountain) in the Parc de la Grange at the Eaux-Vives ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin in Geneva, Switzerland, June 8, 2021. Picture taken with a drone June 8, 2021. REUTERS/Denis Balibouse

The Villa La Grange is pictured with the Jet d'Eau (water fountain) in the Parc de la Grange at the Eaux-Vives ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin in Geneva, Switzerland, June 8, 2021. Picture taken with a drone June 8, 2021. REUTERS/Denis Balibouse

A table is set with a view to the United Nations and the Lake Leman in the Eaux-Vives Parc next to La Grange in Geneva, Switzerland, June 8, 2021. Picture taken June 8, 2021. REUTERS/Denis Balibouse

The Jet d'Eau (water fountain) is pictured from Parc La Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin at the Eaux-Vives in Geneva, Switzerland, June 8, 2021. Picture taken with a drone June 8, 2021. REUTERS/Denis Balibouse

Members of the civil protection install fences outside Parc La Grange at the Eaux-Vives in Geneva, Switzerland, June 8, 2021. REUTERS/Denis Balibouse

Members of the civil protection install fences outside Parc La Grange at the Eaux-Vives in Geneva, Switzerland, June 8, 2021. REUTERS/Denis Balibouse

Members of the civil protection install fences outside Parc La Grange at the Eaux-Vives in Geneva, Switzerland, June 8, 2021. REUTERS/Denis Balibouse

Members of the civil protection install fences outside Parc La Grange at the Eaux-Vives in Geneva, Switzerland, June 8, 2021. REUTERS/Denis Balibouse

A Swiss army truck loaded with fences is parked outside Parc La Grange at the Eaux-Vives in Geneva, Switzerland, June 8, 2021. REUTERS/Denis Balibouse

Workers lay new bitumen in Parc La Grange at the Eaux-Vives in Geneva, Switzerland June 8, 2021. The sign reads: "Parc La Grange closed". REUTERS/Denis Balibouse

The 'Covid Certificate' application of Switzerland for "COVID-19 certificates" for people who have been vaccinated, tested negative or recovered from an infection, is seen in this illustration picture taken June 8, 2021. REUTERS/Denis Balibouse/Illustration

The 'Covid Certificate' application of Switzerland for "COVID-19 certificates" for people who have been vaccinated, tested negative or recovered from an infection, is seen in this illustration picture taken June 8, 2021. REUTERS/Denis Balibouse/Illustration

The 'Covid Certificate' application of Switzerland for "COVID-19 certificates" for people who have been vaccinated, tested negative or recovered from an infection, is seen in this illustration picture taken June 8, 2021. REUTERS/Denis Balibouse/Illustration

The Villa La Grange is pictured with Lake Leman in the background, ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin in Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

The entrance of Parc de la Grange is pictured in the Parc de la Grange, in Eaux-Vives ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

A boat is pictured on Lake Leman and in front of the Jet d?Eau water fountain, ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

The Villa La Grange is pictured in the Parc de la Grange ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Eaux-Vives, Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

People exercise near the Villa La Grange, ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

The Jet d'Eau water fountain is pictured ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

A boat is pictured on Lake Leman from the Villa La Grange, ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin in Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

The Jet d'Eau water fountain is pictured ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

Security officers stand outside the Villa La Grange, ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, in Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

The Villa La Grange is pictured in the Parc de la Grange, in Eaux-Vives, ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin, Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

The Villa La Grange is pictured in the Parc de la Grange, in Eaux-Vives, ahead of the June 16 summit between U.S. President Joe Biden and Russian President Vladimir Putin in Geneva, Switzerland, June 4, 2021. Picture taken June 4, 2021. REUTERS/Denis Balibouse

The water jet (Jet d'Eau) fountain is seen as a rain storm approaches in Geneva, Switzerland, June 4, 2021. REUTERS/Denis Balibouse

Soccer Football - Euro 2020 - Switzerland Training - Bad Ragaz, Switzerland - June 4, 2021 Switzerland's Edimilson Fernandes, Denis Zakaria, Remo Freuler and Nico Elvedi during training REUTERS/Arnd Wiegmann

Soccer Football - Euro 2020 - Switzerland Training - Bad Ragaz, Switzerland - June 4, 2021 Switzerland coach Vladimir Petkovic during training REUTERS/Arnd Wiegmann