The Independent report:
A massive Nato war games exercise took the world to the brink of nuclear disaster when the Soviet Union mistakenly believed the drill was a real attack, freshly released classified documents have revealed.
The threat came in 1983 when the British- and American-led exercise, Operation Able Archer, moved 40,000 troops across Western Europe.
The operation was so realistic that in response the Soviet Union deployed nuclear submarines under the Arctic and prepared a dozen aircraft carrying nuclear weapons.