Brits fear: North Korea "secretly helped by Iran to gain nuclear weapons"

The Foreign Office is investigating whether “current and former nuclear states” helped Kim Jong-Un in his drive to mount nuclear warheads on missiles.

Senior Whitehall sources told The Sunday Telegraph it is not credible that North Korean scientists alone brought about the technological advances.

Iran is top of the list of countries suspected of giving some form of assistance, while Russia is also in the spotlight.