Mottaki made the comment in a speech at an international conference on disarmament in Geneva.
He did not specify what kind of guarantees Iran is prepared to give.
Iran's government spokesman said earlier today that Iran had no intention of suspending uranium enrichment, the key demand of the Security Council.
Iran says its nuclear program is entirely peaceful.
But Western countries remain suspicious about Iran's nuclear intentions and aim to curb the country's sensitive nuclear activities.
DIPLOMATIC OFFENSIVE: As the United States and the European Union increase pressure on Iran regarding its nuclear program, Tehran has launched a wide-ranging and ambitious diplomatic offensive, including high-level state visits with countries including China, Indonesia, Afghanistan, Azerbaijan, and Pakistan. In May, Iranian President Mahmud Ahmadinejad participated in a high-profile summit of the so-called Developing 8 (D8) group of countries in Bali. Below are some links to RFE/RL's coverage of Iran's efforts to boost international support for its position.
ARCHIVE To view all of RFE/RL's coverage of Iran, click here.