Washington, Shawwal 5, 1435, Aug 1, 2014, SPA -- US President Barack Obama says the US has done everything it can to convince Russia to change course in Ukraine, dpa reported. Russian President Vladimir Putin is working contrary to the best interests of his country and the West had done what it could short of war to influence him to back down. -- SPA 23:37 LOCAL TIME 20:37 GMT www.spa.gov.sa/1258945