By Chiara Fiorillo The US is reportedly planning to station nuclear weapons in the UK for the first time in 15 years amid a growing threat from Russia. Warheads that could be located at RAF Lakenheath in Suffolk under the proposals are believed to be B61-12 gravity bombs. They can be deployed from fighter jets and are said to be three times as strong as the Hiroshima bomb. The US previously placed nuclear missiles at RAF Lakenheath, removing them in 2008 when the Cold War threat from Moscow had receded. But Pentagon documents seen by The Telegraph reveal procurement contracts for a new facilit…