The world will not quickly forget the sight of Neville Chamberlain waving a piece of paper in the air on his return from Munich, confidently announcing “peace in our time” and claiming he had “Herr Hitler’s signature” to prove it. The leaders of North and South Korea have now signed a peace declaration of their own, which “solemnly declares before the 80 million Korean people and the whole world that there will be no more war on the Korean Peninsula and thus a new era of peace has begun”.