By Crispian Balmer
"What is happening in Iran is clearly not good news for anyone, neither for the Iranians nor for peace and stability in the world," said Henri Guaino, one of French President Nicolas Sarkozy's closest advisors.
Protesters have clashed with police in Tehran for two days running after Iranian authorities declared hard-liner Mahmoud Ahmadinejad outright winner in a contested presidential ballot.
France is a permanent member of the United Nations Security Council and is part of a group of six world powers that is trying to persuade Iran to halt its nuclear ambitions.
French Foreign Minister Bernard Kouchner said on Sunday that "brutal" repression of Ahmadinejad's opponents was closing the door to dialogue within Iran and warned that confrontation would be counterproductive.
"Brutality and never-ending military development will not bring any solutions," Kouchner said after meeting U.S. special envoy to the Middle East George Mitchell in Paris.
The United States, Russia, China, France, Germany and Britain have invited Iran to talks to find a diplomatic solution to the nuclear row, but Tehran has so far rejected the offer.
The major powers suspect Iran wants to produce a nuclear weapon. Tehran says it wants to generate electricity.
Guaino repeated that Iran had to let international observers visit its nuclear sites and said Tehran also had to recognize Israel's right to exist.
"If we cannot start a dialogue on this sort of a basis then we will head into an extremely dangerous situation," he told France's Europe 1 radio.
"If Iran gets the nuclear bomb coupled with an aggressive political stance, then there is naturally the risk of a confrontation with those who feel threatened," he said, in apparent reference to Israel.
Kouchner said the election campaign had raised hopes that there would be an open debate within Iran over its future direction and added that "civil Iranian society" clearly wanted such a dialogue.
"France regrets that instead of openness there has been quite a brutal response… This will leave its mark, and the opposition will organize itself."
Iran's Supreme Leader Ayatollah Ali Khamenei has told all Iranians to rally behind Ahmadinejad, but opponents have denounced the vote as a fraud.
Asked if he thought the election was rigged, Kouchner said: "Let's not throw any oil on the fire."
