Serbia's president asked Russian President Vladimir Putin for advice Wednesday on how to counter Kosovo's "violence and aggression" against Serbs — a development that could complicate Western attempts to find a peaceful solution to the crisis in the Balkans.

Aleksandar Vucic's office said in a statement that he informed Putin about the "brutal attack" by Kosovo police on Monday against a senior Serb official who was arrested and expelled after entering the country without an official permit.

See at: http://abcnews.go.com/International/wireStory/us-urges-kosovo-serbia-normalize-ties-dialogue-54062909