(Reuters) – Five foreign vice-presidents of Russia’s Rosneft have resigned because of European Union sanctions forbidding European citizens or Russians living in the EU to work at the Kremlin oil major, six sources familiar with the matter said. They said the five – Didier Casimiro, Eric Liron, Zeljko Runje, Avril Conroy and Otabek Karimov – left Rosneft days ahead of fresh EU sanctions over the Russian assault on Ukraine that came into effect on May 15, the sources said. All five joined the state-owned Russian company in 2012 or early 2013, according to the Rosneft website. Rosneft declined t…