Talks between Yugoslav leaders on halting the nation's slide toward possible civil war collapsed Friday with a boycott by Croatia and a walkout by the Slovenian president who said he will demand the opening of talks on the total "dissolution" of the multiethnic federation.

Just before Slovenian President Milan Kucan's departure, Yugoslav President Borisav Jovic warned members of the eight-man collective presidency that he would take unspecified measures to prevent "complete chaos," an apparent reference to his power to order intervention by the communist-led Yugoslav military.