Since 1995, he is a Member of the Institut de Droit International. In 2013, in Tokyo, he was elected President of the Institut de Droit International. He was First Deputy Foreign Minister of Estonia and a Member of the UN Human Rights Committee. In 1994-2009 — Professor and Chair of international law at King’s College London. He taught at The Hague Academy of International Law. Author of 13 books on international law and politics and more than 200 articles and reviews.