Updated

Russia is pulling out its experts from the Iranian nuclear reactor site they were helping build, U.S. and European government representatives said Tuesday. The move reflected a growing rift between Iran and Russia that could lead to harsher U.N. sanctions on the Islamic republic for its refusal to stop uranium enrichment.

The representatives — a European diplomat and a U.S. official — said a large number of Russian technicians, engineers and other specialists have returned to Moscow within the last week, at about the same time senior Russian and Iranian officials tried unsuccessfully to resolve financial differences over the Bushehr nuclear reactor. They spoke to The Associated Press on condition of anonymity because their information was confidential.