President Obama vowed prompt U.N. sanctions against Iran after Tehran announced it had begun a program to enrich uranium, which the West fears could be used to build nuclear weapons. Iran's announcement was effectively a rejection of last year's U.S. offer to convert Iranian uranium into medical isotopes in a third country. The new sanctions would target members of Iran's Revolutionary Guards Corps, who are thought to control the nuclear program. Russia is expected to support the measures, but China, one of the five veto-wielding members of the Security Council, has cautioned against them.
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