Iran issued a warning to world powers Thursday that an attack on its nuclear facilities would trigger a "domino" effect across the Middle East.

"Playing with security of Iran is like dominos," said Saeed Jalili, Iran's new chief negotiator. "We believe the world powers are aware about Iran's effective role in the global security. Our role in Afghanistan and Iraq is in direction with peace, stability and improving governments there."

World leaders met to discuss Iran's cooperation with United Nations resolutions aimed at ending Iran's development of nuclear weapons.

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Mohamed El Baradei, director general of the International Atomic Energy Agency, wants to give Iran more time, show in his agency's latest report that the country has cooperated with negotiators.

The United States and Britain want a third round of sanctions against Iran while China and Russia appear to back El Baradei's position to let negotiators have more time.

The UN Security Council adopted two rounds of sanctions resolutions against Iran.

"El Baradei wants to get across that Iran has shown real willingness to cooperate and we are making important progress, so let's stick with it," said a Vienna-based diplomat.