(Reuters) – U.S. President Barack Obama on Wednesday announced the most wide-ranging sanctions yet on the Russian economy, targeting key institutions including Gazprombank and Rosneft Oil Co, as well as other energy and defense companies. Washington has steadily escalated its financial sanctions on Russia over what it views as Moscow’s interference in its neighbor Ukraine and its annexation of the Crimea region. Obama said the United States could impose further sanctions if Russia did not […]