Iran hopes sufficient progress will be made at talks with major powers this week to enable negotiators to start drafting an accord settling a dispute about Tehran's nuclear programme, Iranian media quoted a top Iranian negotiator as saying. The Islamic Republic and six world powers will hold a fresh round of talks in Vienna on Tuesday and Wednesday intended to reach a comprehensive agreement by July 20 on how to resolve a decade-old dispute that has stirred fears of a Middle East war. Iran says its enrichment programme is a peaceful bid to generate electricity and has ruled out shutting any of its nuclear facilities. It denies having any nuclear bomb designs.