Russia's UN Envoy Says Iran Did All To Accommodate Europeans, U.S., But Western Powers Made No Compromises, Reimposition Of UN Sanctions On Iran Could Have Very Adverse Consequences, Lead To Escalation In Middle East; China's UN Envoy Says Iran Has Repeatedly Sent Positive Signals, Says Delaying UN Sanctions Reimposition Would Keep Diplomacy Open; France's UN Envoy Says European Powers Have Multiplied Efforts To Reach A Solution, Iran Did Not Produce Any Specific Gestures, Preferred To Postpone Everything