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Reporting from Washington — Efforts by the United States and its European allies to build a united front to halt Iran's nuclear program are facing increasingly bold resistance from China, Russia, India and Turkey, which are rushing to boost their economies by seizing investment opportunities in defiance of sanctions imposed by the West.

The Obama administration and the European Union opted to try to toughen United Nations sanctions against Iran with their own unilateral restrictions on foreign companies that do business with Tehran's energy sector, hoping that squeezing the country's most lucrative industry can force the Islamist government to bend on its nuclear program.