BRUSSELS (Reuters) – Russian state-owned companies Rosneft and Gazprom will be able to ship oil to third countries under an adjustment of European Union sanctions agreed by member states this week aimed at limiting the risks to global energy security. Major trading houses such as Vitol, Glencore and Trafigura as well as oil majors such as Shell and Total have stopped trading Russian oil for third parties, citing EU sanctions, including restrictions on insurance. Purchases of Russian seaborne crude oil by EU companies and its export to third countries is allowed, but under tweaks to sanctions o…