By Louis Charbonneau and Francois Murphy

BERLIN/PARIS, Sept 14 (Reuters) - A split has emerged in the coalition of Western powers pressuring Iran to freeze its nuclear enrichment programme, as France backs U.S. calls for a new round of sanctions while Germany urges restraint.

The United States, Germany, France and Britain have led a diplomatic drive to punish Iran for refusing to halt its uranium enrichment programme. They succeeded in persuading reluctant Russia and China to back two U.N. sanctions resolutions.

Despite the sanctions, which have led to a sharp decrease in Western trade with Iran, Tehran refuses to abandon a programme it says is meant for the peaceful generation of electricity.

Washington, which suspects Iran is seeking nuclear weapons, believes the time has come to expand the sanctions and has called a Sept. 21 meeting of the six powers to discuss a third sanctions resolution to submit to the U.N. Security Council.

France said on Friday it was ready to take fresh action. "We wish to have new sanctions adopted, as a priority in the U.N. Security Council," Foreign Ministry spokesman Frederic Desagneaux told a regular news conference in Paris.

Germany, however, said discussion of fresh sanctions would not be necessary if Iran cooperated with the United Nations and cleared up doubts about its nuclear programme.

"Germany is ready, if necessary, to take the necessary steps against Iran," Foreign Ministry spokesman Martin Jaeger said.

But as a member of the International Atomic Energy Agency (IAEA), Germany was also open to "giving Iran a chance to recover the international community's lost confidence in its nuclear programme," Jaeger said at a regular news conference.

"If Iran is ready to do this ... then I think we can spare ourselves future sanctions debates."

The IAEA, the U.N. watchdog, reached a deal with Tehran on Aug. 21 meant to bring transparency to Iran's nuclear programme.

Diplomats say Berlin wants to delay drafting any sanctions resolution until after IAEA chief Mohamed ElBaradei gives a progress report to the agency's board of governors in November.

The United States, France and Britain fear the transparency pact will allow Tehran time to build its capacity to enrich uranium, a process that can make fuel for nuclear bombs.

EARLY SANCTIONS UNLIKELY

Western diplomats in Vienna, where the IAEA has its headquarters, say they believe a new sanctions drive will be on hold pending a verdict from ElBaradei on the transparency pact.

Russia and China are in any case opposed to fresh sanctions.

One diplomat said that over the next few months it would become clear whether Iran was serious about clearing up questions about past, secret nuclear-related activities. If not, that would create a stronger basis for a third resolution.

"Whether you like it or not, it will be very difficult to get consensus ... to return to the Security Council as long as the (Iran-IAEA) work plan has a chance," a senior European diplomat in Vienna told Reuters.

Desagneaux said the IAEA deal was a step in the right direction but not enough as it did not address the suspension of Iran's enrichment work as the Security Council has demanded.

He even suggested the European Union could adopt its own sanctions beyond what the United Nations has approved. "We remind you that there are already measures taken outside that framework, in the framework of the European Union," he said.

Iran has said fresh sanctions could jeopardise the deal with the IAEA.

"If the Security Council tightens sanctions against Iran, then in the future our cooperation with the International Atomic Energy Agency will come to a halt," Iran's Interior Minister Mostafa Pourmohammadi said during a visit to Beijing. (Additional reporting by Mark Heinrich in Vienna)

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