Russia’s nuclear threat

SIR – Philip Roberts (Letters, May 1) is concerned about Britain’s nuclear deterrence policy. However, he should not doubt that Mutually Assured Destruction is extant.

Vladimir Putin and his various mouthpieces can puff themselves up and threaten a nuclear strike until the cows come home. In the meantime the Royal Navy patrols unseen 365 days a year, ready to retaliate if Britain or a Nato nation is attacked.

The French and the United States have their own nuclear deterrents, which will also influence Mr Putin’s decision-making.

Squadron Leader Dave Tisdale (retd) Ryde, Isle of Wight