NEW YORK (Reuters) - President Barack Obama aimed a direct blow at Russia's economic heart on Wednesday with sanctions on Rosneft, the flagship oil giant that generates more than 4 percent of the world's crude and over 8 percent of the country's GDP.
But in a change of tack from previous similar efforts, the measures were narrowly tailored to slowly starve the state-run energy firm of U.S. dollar funding, not bar it from doing business with oil buyers such as BP or stymie multibillion-dollar ventures with firms like ExxonMobil, experts say.