(BELGRADE) - Tomislav Nikolic, acting leader of Serbia's ultra-nationalist main opposition resigned from posts in his party following disagreement on the country's EU future, Beta news agency reported Saturday.

"Tomislav Nikolic resigned last night from the post of deputy leader of the Serbian Radical Party (SRS) as well as from the post of the party parliamentary group's chief," the agency said, quoting a SRS statement.

According to local media reports Nikolic resigned over a disagreement within the party on support for Serbia's rapprochement with the European Union.

Nikolic on Thursday made an unexpected political shift, saying the SRS would vote for ratification of the Stabilisation and Association Agreement (SAA), signed in April between Belgrade and the EU.

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