Measures include scrutiny of financial transactions and periodic inspections . The U.S. has lobbied other countries to boost sanctions against Iran . Iran has dismissed claims that it is using uranium to build a nuclear weapon . The country has defied UN Security Council resolutions , the IAEA says .
Measures include scrutiny of financial transactions and cargo inspections . The U.S. has lobbied other countries to boost sanctions against Iran . Iran has dismissed suspicions that it is enriching uranium to build a nuclear bomb . The country has defied U.N. Security Council resolutions , the IAEA says .