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KALININGRAD, RUSSIA - JUNE 21, 2018: Football fans from Switzerland Beat Studer, Josef Wyer, and Werner Zimmermann (L-R), who have arrived in Kaliningrad by a 1964 Gritli tractor, seen outside Kaliningrad Stadium. Three football fans set off on June 9 from Mount Rigi in Central Switzerland and have covered about 1,800km to arrive in Kaliningrad on June 21; they are to support their national football team in a 2018 FIFA World Cup match against Serbia on June 22, 2018. Vitaly Nevar/TASS (Photo by Vitaly Nevar\TASS via Getty Images)

KALININGRAD, RUSSIA - JUNE 21, 2018: Football fans from Switzerland Beat Studer, Josef Wyer, and Werner Zimmermann (L-R), who have arrived in Kaliningrad by a 1964 Gritli tractor, seen outside Kaliningrad Stadium. Three football fans set off on June 9 from Mount Rigi in Central Switzerland and have covered about 1,800km to arrive in Kaliningrad on June 21; they are to support their national football team in a 2018 FIFA World Cup match against Serbia on June 22, 2018. Vitaly Nevar/TASS (Photo by Vitaly Nevar\TASS via Getty Images)
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TASS Vitaly Nevar

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KALININGRAD, RUSSIA - JUNE 21, 2018: Football fans from Switzerland Beat Studer, Josef Wyer, and Werner Zimmermann (L-R), who have arrived in Kaliningrad by a 1964 Gritli tractor, seen outside Kaliningrad Stadium. Three football fans set off on June 9 from Mount Rigi in Central Switzerland and have covered about 1,800km to arrive in Kaliningrad on June 21; they are to support their national football team in a 2018 FIFA World Cup match against Serbia on June 22, 2018. Vitaly Nevar/TASS (Photo by Vitaly Nevar\TASS via Getty Images)

KALININGRAD, RUSSIA - JUNE 21, 2018: Football fans from Switzerland Beat Studer, Josef Wyer, and Werner Zimmermann (L-R), who have arrived in Kaliningrad by a 1964 Gritli tractor, seen outside Kaliningrad Stadium. Three football fans set off on June 9 from Mount Rigi in Central Switzerland and have covered about 1,800km to arrive in Kaliningrad on June 21; they are to support their national football team in a 2018 FIFA World Cup match against Serbia on June 22, 2018. Vitaly Nevar/TASS (Photo by Vitaly Nevar\TASS via Getty Images)
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TASS Vitaly Nevar

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KALININGRAD, RUSSIA - JUNE 21, 2018: Football fans from Switzerland Beat Studer, Josef Wyer, and Werner Zimmermann (L-R), who have arrived in Kaliningrad by a 1964 Gritli tractor, hold the Swiss national flag outside Kaliningrad Stadium. Three football fans set off on June 9 from Mount Rigi in Central Switzerland and have covered about 1,800km to arrive in Kaliningrad on June 21; they are to support their national football team in a 2018 FIFA World Cup match against Serbia on June 22, 2018. Vitaly Nevar/TASS (Photo by Vitaly Nevar\TASS via Getty Images)

KALININGRAD, RUSSIA - JUNE 21, 2018: Football fans from Switzerland Beat Studer, Josef Wyer, and Werner Zimmermann (L-R), who have arrived in Kaliningrad by a 1964 Gritli tractor, hold the Swiss national flag outside Kaliningrad Stadium. Three football fans set off on June 9 from Mount Rigi in Central Switzerland and have covered about 1,800km to arrive in Kaliningrad on June 21; they are to support their national football team in a 2018 FIFA World Cup match against Serbia on June 22, 2018. Vitaly Nevar/TASS (Photo by Vitaly Nevar\TASS via Getty Images)
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TASS Vitaly Nevar

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KALININGRAD, RUSSIA - JUNE 21, 2018: Football fans from Switzerland Josef Wyer, Beat Studer, and Werner Zimmermann (L-R), who have arrived in Kaliningrad by a 1964 Gritli tractor, seen outside Kaliningrad Stadium. Three football fans set off on June 9 from Mount Rigi in Central Switzerland and have covered about 1,800km to arrive in Kaliningrad on June 21; they are to support their national football team in a 2018 FIFA World Cup match against Serbia on June 22, 2018. Vitaly Nevar/TASS (Photo by Vitaly Nevar\TASS via Getty Images)

KALININGRAD, RUSSIA - JUNE 21, 2018: Football fans from Switzerland Josef Wyer, Beat Studer, and Werner Zimmermann (L-R), who have arrived in Kaliningrad by a 1964 Gritli tractor, seen outside Kaliningrad Stadium. Three football fans set off on June 9 from Mount Rigi in Central Switzerland and have covered about 1,800km to arrive in Kaliningrad on June 21; they are to support their national football team in a 2018 FIFA World Cup match against Serbia on June 22, 2018. Vitaly Nevar/TASS (Photo by Vitaly Nevar\TASS via Getty Images)
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KALININGRAD REGION, RUSSIA - JUNE 21, 2018: Football fan from Switzerland Beat Studer, traveling with two friends to the Russian city of Kaliningrad by a 1964 Gritli tractor, seen at a petrol station. Three football fans set off on June 9 from Mount Rigi in Central Switzerland and are planning to cover about 1,800km to arrive in Kaliningrad on June 21; they are traveling to support their national football team in a 2018 FIFA World Cup match against Serbia on June 22, 2018. Vitaly Nevar/TASS (Photo by Vitaly Nevar\TASS via Getty Images)

KALININGRAD REGION, RUSSIA - JUNE 21, 2018: Football fan from Switzerland Beat Studer, traveling with two friends to the Russian city of Kaliningrad by a 1964 Gritli tractor, seen at a petrol station. Three football fans set off on June 9 from Mount Rigi in Central Switzerland and are planning to cover about 1,800km to arrive in Kaliningrad on June 21; they are traveling to support their national football team in a 2018 FIFA World Cup match against Serbia on June 22, 2018. Vitaly Nevar/TASS (Photo by Vitaly Nevar\TASS via Getty Images)
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TASS Vitaly Nevar