The causes and immediate consequences of wars are picked over again and again, but less thought often goes into thinking about what the world will look like after a war. Drawing upon the contrast between planning for the post-World War II world and the lack of such planning at the end of the Cold War, Jan Ruzicka – a lecturer in security studies at the University of Aberystwyth – takes us through what the world will look like once the war in Ukraine has ended and asks us to imagine a more secure and safer world.