Why do Russia fans support Serbia in their World Cup games?
World Cup hosts have a soft spot for the Serbs because of the history between the two nations
RUSSIA have already booked their spot in the last 16 of the World Cup.
The hosts may now show their support for Serbia - who will go head-to-head with Brazil in their final group stage match.
Why do Russia fans support Serbia in their matches?
It could come as a huge shock to see a Russian cheering on Serbia, but it is all for good reason.
A large number of people from both countries share the same religion - Orthodox Christianity.
And the history between the two nations goes all the way back to the 1800's.
Russia helped Serbia gain Independence against Turkey by putting forward a number of volunteers to fight in the Timok-Morava Army.
Teams from both countries tend to get along - including Red Star Belgrade with Spartak Moscow and Partizen Belgrade with CSKA Moscow.
In 2016, the two countries signed a military-technical assistance agreement that saw Serbian receive a number of gifts.
This included six Mikoyan MiG-29 fighters, 30 tanks and 30 armoured tanks as part of the deal.
Two years ago, Russia's export to Serbia totalled £679bn.
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How are Russia and Serbia getting on at the World Cup?
Russia finished second in Group A with two wins and one defeat in Russia.
As a result, they will take on Spain at the Muzhniki Stadium in Moscow this weekend.
But it's a different story for Serbia, who are still battling to book their spot in the last 16.
The Serbs know that they need a win against Tite's side to progress.