The United States says it expects the UN Security Council to begin working as early as next week on a resolution to sanction Iran over its nuclear program.
US Undersecretary of State Nicholas Burns said diplomats from six world powers will have more discussions on the issue Monday in Berlin. After that, he said work on a draft resolution should be moved to the Security Council.
Burns met in Berlin Thursday with diplomats from Britain, France, Russia and China plus Germany.
Media reports suggest that not all of the diplomats agreed on how to proceed with Iran.
In Tehran during Friday prayers, a senior Iranian cleric Ayatollah Emami Kashani warned that the world will suffer if Iran faces sanctions.
Iran's chief nuclear negotiator, Ali Larijani, meets with European Union foreign policy chief Javier Solana on Saturday.
In Rome, Italy's Prime Minister Romano Prodi says he told Larijani in a meeting on Friday that it is in Iran's interest to suspend uranium enrichment as demanded by the Security Council.
Iran says it is ready for negotiations but will not halt uranium enrichment, which it says is for peaceful uses.
France's Foreign Minister Philippe Douste-Blazy has signaled France is flexible on the demand that Iran suspend uranium enrichment before negotiations can begin. Russia and China have long been reluctant to punish Tehran.