(BRUSSELS) - The EU's foreign policy chief, Javier Solana, said Tuesday he hoped Belgrade's arrest of Radovan Karadzic would now help now help unblock a key EU-Serbia accord.

"We have to talk to the prosecutor of international tribunal but I am almost certain he is going to say there is full cooperation," Solana, the EU's high commissioner for foreign relations, said as he arrived at a meeting of foreign ministers in Brussels.

The International Criminal Tribunal for Former Yugoslavia (ICTY) must judge that Serbia has offered "full cooperation" over the arrest over Karadzic, one of the world's most wanted war criminals.

"I hope very much he (the ICTY prosecutor) will say there is full cooperation," Solana added.

Solana said the arrest of the Bosnian-Serb was a step "in the right direction", but warned that there were a "few criminals still at large."

Serbia, now under a pro-European government, has already signed a stabilisation and association agreement with the EU, but the capture of Karadzic was a pre-condition for full entry talks.

The ICTY prosecutor, Serge Brammertz, must give his judgement that Serbia is in "full cooperation" with his court.

Arriving at the same meeting, Swedish Foreign Minister Carl Bildt -- himself a former mediator in the former Yugoslavia -- called it "a step. It is not necessarily 'the' step."

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