By Ian Bond, Denis Corboy, William Courtney, Craig Dunkerley
Ian Bond is director of foreign policy at the Centre for European Reform, and was British Ambassador to Latvia.
Denis Corboy is visiting senior research fellow at King's College London, and served as European Union ambassador to Armenia and Georgia.
William Courtney was U.S. ambassador to Kazakhstan and Georgia.
Craig Dunkerley was the special envoy of the U.S. Secretary of State for Conventional Forces in Europe.