I don't think you realize, this is not a favorable story. Look at the name on the signs- Serbian Radical Party, the SRS. They are a hyper-nationalist, fascist party. During the Serbian civil war, they formed paramilitary groups loyal to Slobodan Milosevic (they were called the White Eagles). Many in their party were tried for war crimes, including the current SRS leader.
This would be like if the Aryan Nation was chanting for Trump here.