Petro Poroshenko - Obama Presidency Oral History Back Petro Poroshenko Index / People Transcripts Hillary Clinton ...met with Medvedev, [Sergei] Lavrov, and [Petro] Poroshenko , the national security advisor for th... Related Topics go to the Obama in the Senate Obama in the Senate go to the Arts and Humanities Arts and Humanities go to the Russia Russia go to the Nuclear Nonproliferation Nuclear Nonproliferation go to the Veterans Veterans