moscow carter page businessman previously describe foreign-policy adviser u.s. president-elect donald trump say friday saw significant business opportunities russia page arrive moscow thursday tell russia ria news agency visit russia work economic project current nature relationship trump team unclear firmly believe opportunities cooperation private sector russian economy never great come years page quote say despite west antagonistic policy unavoidable reaction moscow limit opportunities past decades possibilities today unique page previously work russia spend three years moscow u.s. investment bank merrill lynch credentials come scrutiny name one people brief presidential candidate trump tell ria 11.3 billion deal qatar swiss trader glencore glen.l buy state stake russian oil major rosneft rosn.mm announce early week show sanction russia hurt western firm hostile efforts punish rosneft group senior executives help western sanction mainly hurt western firm achieve goal say one-time trump adviser page see opportunities russia