The European Union is set to resume talks with Serbia on forging closer ties, the EU has announced.
President Tadic wants to steer Serbia into the European Union
Serbia hopes the talks will eventually lead to full membership of the EU.
The EU said the decision to resume talks on 13 June followed Belgrade's improved co-operation with the UN war crimes tribunal.
The European Commission called on Serbia to ensure that all remaining suspects were arrested, including ex-Bosnian Serb General Ratko Mladic.
"I encourage Serbia to continue improving its co-operation with the tribunal in the Hague, to ensure that all remaining indictees are brought to justice, thus achieving lasting reconciliation in the Western Balkans," said European Commission President Jose Manuel Barroso.
Serbian President Boris Tadic has put a high priority on completing co-operation with the UN tribunal and accession talks with the EU.
On Wednesday, UN war crimes prosecutor Carla del Ponte visited Belgrade and said Serbia had shown the will to arrest the remaining war crimes fugitives.
At the end of last month, Zdravko Tolimir, a former Bosnian Serb general and close aide to Ratko Mladic, was arrested in a joint operation by Bosnian Serb and Serbian police in the border area between the two territories.