The crisis in Crimea is heralding the rise of a new era of American energy diplomacy, as the Obama administration tries to deploy the vast new supply of natural gas in the United States as a weapon to undercut the influence of the Russian president, Vladimir V. Putin, over Ukraine and Europe. The crisis has escalated a State Department initiative to use a new boom in American natural gas supplies as a lever against Russia, which supplies 60 percent of Ukraine’s natural gas and has a history of cutting off the supply during conflicts. This week, Gazprom, Russia’s state-run natural gas company, said it would no longer provide gas at a discount rate to Ukraine, […]