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Middle East Russian nuclear support for Iran limited by distrust

Russia has trained hundreds of Iranian nuclear scientists and blocked international action against Tehran. But beneath the surface, there is profound distrust. 

Alexander Nemenov/AP

Russia built Iran's first nuclear power plant, once sold Tehran sophisticated weaponry, and refuses to back further international sanctions over Iran's controversial nuclear program, but this apparent coziness belies years of suspicion and growing distance between the two nuclear powers.