Serbian and Croatian leaders promised to try to stop the renewed fighting in Croatia as peace talks on former Yugoslavia resumed Saturday, a con-ference spokesman said in Geneva.

Fred Eckhard described talks among international mediators Cyrus Vance and Lord Owen, Yugoslav President Dobrica Cosic, Serb President Slobodan Milosevic and Croatian President Franjo Tudjman as "productive.""There seems to be at the highest political level an understanding that what has happened and is happening will be contained and will not be allowed to undermine the peace process," Eckhard said.

He said there was agreement on "stopping the fighting and bringing about maximum pressure on the local commanders to do that." But he would not say whether there were formal moves toward a cease-fire.

"This war has to be stopped immediately," said Cosic, president of the Serb-led Yugoslav federation.