Iranian Foreign Minister Manouchehr Mottaki on Wednesday dismissed the new U.S. nuclear strategy as " propaganda" and urged Washington to fulfill its promise on nuclear disarmament.

"We consider the latest position and comment of the United States as propaganda ... We urge the United States to fulfill its promise on nuclear disarmament in the whole world," Mottaki said at a press conference in Tehran.

He said that nuclear weapons are "the biggest threat" to international peace and security and the international community should treat nuclear disarmament as a top priority.

Mottaki reiterated that Iran's nuclear activities are "purely peaceful."

He also said that the upcoming international conference of nuclear disarmament, dubbed "nuclear energy for all, nuclear weapons for none," scheduled to held in Tehran on April 17 and 18, will push for a global nuclear disarmament.

The United States unveiled Tuesday its long-anticipated new nuclear strategy, promising to reduce the role of nuclear weapons in U.S. national security strategy while reaffirming extended deterrence commitments to its allies.

The document, which establishes U.S. nuclear policy, strategy, capabilities and force posture for the next five to 10 years, marks a break with the Bush-era nuclear doctrine that in fact lowered the threshold of usage of nuclear weapons and weakened the international non-proliferation regime.