Russia is at war with Britain, the US is no longer a reliable ally and the UK has to respond by becoming more cohesive and more resilient, according to one of the three authors of the strategic defence review.

Fiona Hill, from County Durham, became the White House’s chief Russia adviser during Donald Trump’s first term and contributed to the British government’s strategy. She made the remarks in an interview with the Guardian.

“We’re in pretty big trouble,” Hill said, describing the UK’s geopolitical situation as caught between “the rock” of Vladimir Putin’s Russia and “the hard place” of Donald Trump’s increasingly unpredictable US.

Hill, 59, is perhaps the best known of the reviewers appointed by Labour, alongside Lord Robertson, a former Nato secretary general, and the retired genera

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