Because of their proximity to Iran, "the countries of the region are part of the equation and it is important that they be kept constantly informed" about the talks, the last round of which was in Geneva, Sheikh Khaled bin Ahmed Al-Khalifa said.

"We are not asking to be part of the discussions, just to be kept informed," said Sheikh Khaled, who spoke with Kuwaiti Foreign Minister Sheikh Mohammed Al-Sabah, who was visiting Manama. "It is important to us that the discussions do not fail," he said, adding that success in the Iran talks would "ease the situation in the region" of the Gulf.

Iran on Tuesday wrapped up two days of talks in Geneva with the P5+1 grouping of UN Security Council permanent members Britain, China, France, Russia and the United States, plus Germany, over Tehran's nuclear program.

Many Western states believe the Islamic republic is seeking nuclear weapons, a charge Tehran vehemently denies. US diplomatic cables released by whistleblower website WikiLeaks report calls from some Gulf Cooperation Council members for US military action to prevent Iran acquiring a nuclear weapons capability.

On Friday, US Defense Secretary Robert gates said that countries in the Gulf share Washington's view on the threat posed by Iran's nuclear program and support an approach focused on continued sanctions against Tehran.

An Iranian opposition leader says the US cables released by WikiLeaks show Iran is increasingly isolated by neighboring countries that see it as a threat.

The statement by Mir Hossein Mousavi blames his rival, President Mahmoud Ahmadinejad, for hard-line policies that put Iran in a “vulnerable situation” in the region. Tehran has tried to repair relations with Gulf neighbors.

But Mousavi says the cables show Iran is without any allies in the Gulf, where the US maintains a strong military presence.

"Some of these documents clearly show our vulnerable situation in the region, a situation fuelled by adventurism," Mousavi said in comments published on opposition website Qalamsabz on Saturday.

Mousavi accused Ahmadinejad’s government of "inciting fear, of an extremely weak diplomacy and excessive displays of military power" in the region.

"They have ignored forming constructive ties with regional countries, and with these policies we do not have a real ally among our neighbors," Mousavi said. Ahmadinejad has laughed off the documents as "worthless" and insisted Tehran's ties with its Arab neighbors would not be affected.

Mousavi, who was Iran's prime minister during the 1980 to 1988 war against Iraq, ran against Ahmadinejad in the June 2009 presidential election and charged the poll was massively rigged to keep the hardliner in power.

Along with fellow opposition leader Mehdi Karroubi, he has since led an anti-government campaign.

Meanwhile, hundreds of students held a protest rally blaming Britain for the assassination of a prominent Iranian nuclear scientist last month. Lawmaker Hamid Rasaei called the British Embassy a “house of spies” likening it to the former US Embassy in Tehran that was seized by militant students in 1979 and dozens of hostages were held for over a year.

The students also carried photos of Majid Shahriari and Masoud Ali Mohammadi, two slain nuclear scientists, one killed last month, the other back in January.

“We hold you responsible for martyring Shahriani and Ali Mohammadi,” Rasaei said, addressing Britain.