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In an exclusive interview Stephen Sackur speaks to President of Ukraine, Petro Poroshenko, who has been in Britain to attend a summit of NATO leaders. There is a consensus view that the crisis in eastern Ukraine represents the most serious threat to Europe's security and stability since the fall of the Berlin Wall - Ukraine and Russia are just a few steps away from all-out war - but right now there are hopes of a ceasefire. So, is there a path back from the brink?