U.S. Vice President Joe Biden, left, and Serbian Prime Minister Aleksandar Vučić in Belgrade | Oliver Bunic/AFP via Getty Images Serbian greeting for Joe Biden: ‘Vote for Trump’ US vice president offers condolences for NATO bombing.

U.S. Vice President Joe Biden received a hostile welcome in Belgrade Tuesday, with hundreds of Serbian ultra-nationalists making clear their support for Donald Trump.

"Vote for Trump!" the protesters, wearing T-shirts emblazoned with the image of the U.S. Republican candidate, shouted near the Serbian presidency building.

"Trump is the alternative to globalization. He will destroy old centers of power in the United States and he is a supporter of Russia," Vojislav Seselj, head of Serbia's ultra-nationalist Radical Party, said when asked why he was backing Trump, Reuters reported.

Biden, who was visiting Belgrade to encourage Serbia and Kosovo to normalize relations, also offered condolences to Serbs who lost family members in the U.S.-led NATO air strikes during the 1999 Kosovo conflict.

"I'd like to express my condolences to the families of those whose lives were lost in the wars of the 1990s, including those killed as a consequence of the NATO air strikes," he said.