KRUEN, Germany, Sha'ban 20, 1436, Jun 7, 2015, SPA -- British Prime Minister David Cameron said Europe had to stay united to keep sanctions on Russia in place, urging the Group of Seven industrial nations to send Moscow a tough message on Ukraine, according to Reuters. "We need to make sure Europe remains united," Cameron told reporters at the G7. --SPA 14:26 LOCAL TIME 11:26 GMT www.spa.gov.sa/w