Our position has not changed because of the latest events. They must cooperate with the Hague tribunal, said Krisztina Nagy, the spokeswoman for Enlargement Commissioner Olli Rehn.
Unless Mladic is arrested and extradited soon, the European Commission might suspend association talks with Serbia and Montenegro.
Last month EU foreign ministers adopted conclusions warning Serbia of the possibility of the negotiations being suspended unless it achieved full cooperation with the Hague tribunal by the end of March.
The next round of talks on a Stabilisation and Association Agreement with Serbia and Montenegro has been scheduled for 5 April.