"Iran is going to have to understand that the United States will protect its interests if Iran seeks to confront us," Burns continued.
Iran is in a standoff with the West over its defiance of U.N. demands to halt uranium enrichment, which can produce fuel for both nuclear energy and nuclear weapons. Iran says its atomic program is aimed solely at generating energy, but the United States and some of its allies suspect it is geared toward making weapons. The U.N. imposed limited sanctions on Iran last month.
President Mahmoud Ahmadinejad accused the United States Tuesday of stirring up conflict between rival Muslim sects to maintain U.S. influence in the Middle East.
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