The Obama administration’s strategy of punishing Russia with economic sanctions over the Ukraine crisis encountered a new complication on Monday with word that the Russians are negotiating an $8 billion to $10 billion energy deal with Iran, another country ostracized by American-led sanctions, which partly depend on Moscow’s cooperation to be effective. The Russia-Iran energy deal, reported by the Iranian state news media, is the second significant economic collaboration under negotiation between the two countries that could undercut the efficacy of the sanctions on Iran. Those sanctions are widely credited with successfully pressuring the Iranians in the current talks over their disputed nuclear program. Officials at the United States Treasury Department, which enforces economic sanctions against Iran, did not immediately respond to queries about whether the Russia-Iran energy deal would technically violate those sanctions, which prohibit dealings with a range of Iranian government entities and industries and penalize foreigners […]