A senior Russian diplomat on Wednesday angrily rejected U.S. warnings against striking an oil-for-goods contract with Iran, saying that Moscow wouldn’t be intimidated by threats. Deputy Foreign Minister Sergey Ryabkov said in remarks carried by the state RIA Novosti news agency that an increase in Russian-Iranian trade is a “natural process that doesn’t involve any elements of political or economic challenge to anyone.” Russian business daily Kommersant has reported that Moscow plans to buy 500,000 barrels of Iranian oil a day, a deal that would shatter an export limit defined by an interim nuclear agreement world powers and Iran reached last year. More