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Agence France-PresseRUSSIAN President Vladimir Putin's trip to Iran this week, the first by a Kremlin leader in three decades, comes at a vital moment for the Islamic republic's controversial Russian-backed nuclear program.
Mr Putin will be attending a summit of Caspian Sea countries on Tuesday, joined by the leaders of Azerbaijan, Iran, Kazakhstan and Turkmenistan for talks focusing on how to divide the landlocked and energy-rich Caspian.
But his visit also throws a potential diplomatic lifeline to Iranian President Mahmud Ahmadinejad, who faces international isolation and massive US-led pressure against his nuclear power project.
His critics in the West allege it has a secret military component.
"This is crucial against the background of tensions around the Iranian nuclear program," said Alexander Shumilin, a specialist on Middle Eastern issues.
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