Posters offering special discount on Black Friday sales are seen in front of an Essentiel Antwerp fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Special discount on Black Friday sales is offered at a fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

A poster offering special discount on Black Friday sales is seen in front of an Essentiel Antwerp fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

People queue during Black Friday sales in front of a Foot Locker shoe store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Posters offering special discount on Black Friday sales are seen in front of an Essentiel Antwerp fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Posters offering special discount on Black Friday sales are seen in front of a United Colors of Benetton kid's fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Posters offering special discount on Black Friday sales are seen in front of a United Colors of Benetton kid's fashion store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Special discount on Black Friday sales is offered at a Triumph lingerie store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

Shoppers walk past a poster offering special discount on Black Friday sales at a United Colors of Benetton store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

A sign offering special discount on Black Friday sales is seen at a Navyboot shoe store, as the spread of the coronavirus disease (COVID-19) continues, in Zurich, Switzerland November 27, 2020. REUTERS/Arnd Wiegmann

A nurse performs a PCR test at the screening center of Hospital de la Tour during the coronavirus disease (COVID-19) outbreak in Meyrin near Geneva, Switzerland, November 26, 2020. REUTERS/Denis Balibouse

A nurse performs a PCR test at the screening center of Hospital de la Tour during the coronavirus disease (COVID-19) outbreak in Meyrin near Geneva, Switzerland, November 26, 2020. REUTERS/Denis Balibouse

Fog covers the landscape in front of the central Swiss Alps as people enjoy the view from the peak of Mount Uetliberg, in Zurich, Switzerland November 26, 2020. REUTERS/Arnd Wiegmann

A woman jogs during foggy weather in a forest, in Zurich, Switzerland November 26, 2020. REUTERS/Arnd Wiegmann TPX IMAGES OF THE DAY

Fog covers the landscape in front of the central Swiss Alps as people enjoy the view from the peak of Mount Uetliberg in Zurich, Switzerland November 26, 2020. REUTERS/Arnd Wiegmann

Fog covers the landscape in front of the central Swiss Alps as a man climbs up the steps of a look-out tower at Mount Uetliberg, in Zurich, Switzerland November 26, 2020. REUTERS/Arnd Wiegmann

A banner reading: "Responsible Business Initiative - Yes on November 29" is seen on a balcony of a residential building in Zurich, Switzerland November 23, 2020. Picture taken November 23, 2020. REUTERS/Arnd Wiegmann

A banner reading: "Responsible Business Initiative - Yes on November 29" is seen beside a road near Stallikon, Switzerland November 23, 2020. Picture taken November 23, 2020. REUTERS/Arnd Wiegmann

A small banner reading: "Responsible Business Initiative - Yes on November 29" is fixed to the frame of a bicycle in Zurich, Switzerland November 23, 2020. Picture taken November 23, 2020. REUTERS/Arnd Wiegmann

Finland's Foreign Minister Pekka Haavisto leaves after a statement during the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Abdul Habib Zadran, Deputy Minister of Finance of Afghanistan makes a statement during the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Abdul Habib Zadran, Deputy Minister of Finance of Afghanistan makes a statement during the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Deborah Lyons, Special Representative of the Secretary General of the United Nations for Afghanistan makes a statement during the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Deborah Lyons, Special Representative of the Secretary General of the United Nations for Afghanistan makes a statement during the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Abdul Habib Zadran, Deputy Minister of Finance of Afghanistan leaves after a statement during the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Finland's Foreign Minister Pekka Haavisto makes a statement during the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Finland's Foreign Minister Pekka Haavisto arrives a statement during the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Finland's Foreign Minister Pekka Haavisto makes a statement during the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Finland's Foreign Minister Pekka Haavisto takes off his protective mask at the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Afghanistan's Economy Minister Abdul Hadi Arghandiwal and Afghanistan's Foreign Minister Mohammad Haneef Atmar speak prior to the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Afghanistan's Foreign Minister Mohammad Haneef Atmar reacts prior to the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Finland's Foreign Minister Pekka Haavisto and Special Representative of the Secretary General of the United Nations for Afghanistan Deborah Lyons wear protective masks prior to the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Afghanistan's Foreign Minister Mohammad Haneef Atmar reacts at the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

2020 Afghanistan Conference participants arrive for the plenary session at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Swiss Foreign Minister Ignazio Cassis wears a protective mask at the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Afghanistan's Economy Minister Abdul Hadi Arghandiwal and Finland's Foreign Minister Pekka Haavisto wearing protective masks speak prior to the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Afghanistan's Foreign Minister Mohammad Haneef Atmar and Swiss Foreign Minister Ignazio Cassis wearing protective masks bump elbows prior to the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Finland's Foreign Minister Pekka Haavisto, Special Representative of the Secretary General of the United Nations for Afghanistan Deborah Lyons, Afghanistan's Economy Minister Abdul Hadi Arghandiwal, Afghanistan's Foreign Minister Mohammad Haneef Atmar and Finland's Minister for Development Cooperation and Foreign Trade Ville Skinnari wear protective masks as they pose for a group photo prior to the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Finland's Foreign Minister Pekka Haavisto, Special Representative of the Secretary General of the United Nations for Afghanistan Deborah Lyons, Afghanistan's Economy Minister Abdul Hadi Arghandiwal, Afghanistan's Foreign Minister Mohammad Haneef Atmar and Finland's Minister for Development Cooperation and Foreign Trade Ville Skinnari pose for a group photo prior to the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Afghanistan's Foreign Minister Mohammad Haneef Atmar adjusts his headphones at the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Director General of the United Nations Office at Geneva Tatiana Valovaya is seen on the screen as she addresses the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

A general view of the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Finland's Foreign Minister Pekka Haavisto addresses the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse/Pool

Finland's Foreign Minister Pekka Haavisto attends the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Members of staff pose for a photo prior to the plenary session of the 2020 Afghanistan Conference at the United Nations in Geneva, Switzerland November 24, 2020. REUTERS/Denis Balibouse

Banner reading, "Yes to war business initiative", hangs underneath a window of a residential house in Zurich, Switzerland November 23, 2020. REUTERS/Arnd Wiegmann

The V-cableway Terminal of the Jungfrau Railways, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, is pictured in front of the Eiger mountain during last testings before the opening of the Eiger Express on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

A staff cleans the tracks at the Eigergletscher V-cableway and train station, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, during last testings before its opening on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

Passengers wearing protective masks wait to board the Jungfraujoch train at the Kleine Scheidegg, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

A staff works in the Eigergletscher V-cableway and train station, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, during last testings before its opening on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

A sign is pictured in front of a gondola of the Eiger Express in the V-cableway Terminal of the Jungfrau Railways, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, during last testings before its opening on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

A sign is pictured in front of a gondola of the Eiger Express in the V-cableway Terminal of the Jungfrau Railways, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, during last testings before its opening on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

The V-cableway Terminal of the Jungfrau Railways, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, is pictured in front of the Eiger mountain during last testings before the opening of the Eiger Express on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

The V-cableway Terminal of the Jungfrau Railways, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, is pictured in front of the Eiger mountain during last testings before the opening of the Eiger Express on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

The Eigergletscher V-cableway and train station, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, is pictured during last testings before the opening of the Eiger Express on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

Staff walk past a sign in the V-cableway Terminal of the Jungfrau Railways, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, during last testings before the opening of the Eiger Express on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

A staff cleans a Jungfrau sign on the Eigergletscher V-cableway station, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, during last testings before the opening of the Eiger Express on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

A staff takes a selfie near a Jungfrau sign on the Eigergletscher V-cableway station, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, during last testings before the opening of the Eiger Express on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse TPX IMAGES OF THE DAY

A staff stands in front of a gondola of the Eiger Express in the V-cableway EIgergletscher station of the Jungfrau Railways, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, during last testings before its opening on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse

The Eigergletscher V-cableway and train station, a 470 million CHF investment connecting Grindelwald to Maennlichen and Eigergletscher with 2 lifts, is pictured during last testings before its opening on December 4, amid the coronavirus disease (COVID-19) outbreak, in the ski resort of Grindelwald, Switzerland November 23, 2020. REUTERS/Denis Balibouse