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Russia, a veto-wielding permanent member of the United Nations Security Council, has so far refused to publicly support the threat of additional sanctions against Iran.
The atomic power station was once a source of disagreement between Russia and the West, which suspected the Islamic Republic could try to use it to build nuclear weapons.
But in recent years, the United States has dropped its opposition and says the plant removes any need for Iran to have its own enrichment program.
Russia says the plant is purely civilian and cannot be used for any weapons program as it will come under International Atomic Energy Agency supervision. Iran will have to return all spent fuel rods to Russia.
Russia agreed to build the plant in 1995 on the site of an earlier project begun in the 1970s by German firm Siemens. The Siemens' project was disrupted by Iran's 1979 Islamic revolution and the 1980-88 Iran-Iraq war.
Russia says to start Iran nuclear plant in 2010
Head of the Rosatom state nuclear corporation says after cabinet meeting in Moscow, 'There is absolutely no doubt 1,000 megawatt Bushehr plant will be built this year'. Clinton in response: 'We will not be waited out; we will not back down'