Wherever you look in geopolitics today there is an overwhelming sense of uncertainty, and its not just because we're still grappling with a global pandemic. Russian troops are massing on the Ukrainian border, China and the US are locked in cold war style hostility. Cyber-warfare makes states, systems and individuals feel newly vulnerable. Stephen Sackur speaks to Sir Peter Westmacott who was Britain's ambassador in Washington, Paris and Ankara. Are we at a point of peak geopolitical risk? Show less