A damaged Vladimir Putin submarine is being watched closely by NATO as it sails on the surface past the British coast. The diesel-electric Black Sea fleet submarine Novorossiysk has suffered a leakage of fuel into the hold creating an “explosive hazard”. The 243-ft long submarine - potentially capable of carrying nuclear weapons, although there is no evidence it has Kalibr missiles on board - has been reported by a Russian source to be “experiencing serious technical problems” after getting