In Iran’s push for a nuclear deal, it’s had few better allies than Moscow. But if an agreement is reached this week, President Vladimir Putin’s regime will have at least one reason to reflect on its support. Russia, which vies with Saudi Arabia and the U.S. to be the world’s largest oil producer, has the most to lose when Iran returns to the global energy market, according to a dozen analysts and executives at oil companies, banks and trading houses interviewed by Bloomberg. “Iran is going to be competing in Europe head-on with Russia,” said Ed Morse, head of commodities research at Citigroup Inc. Iran has been barred from selling oil in Europe since 2012 when the European Union imposed a ban on crude imports. Coupled with tougher U.S. sanctions making it more difficult to buy Iranian oil with […]