Map shows how much of UK could be destroyed if Russia launched nuclear bomb ​on London

A disturbing virtual tool allows people to see how devastating the impact of nuclear war would be.

As Russia, one of the world's atomic weapons super powers, heads west and invades Ukraine, Cold War fears about a nuclear holocaust natural slip into the public conscience.

Vladimir Putin 's country currently have 6,257 weapons, compared to the US's 4,018 and the UK's 225.