On Monday the head of the British military, Gen. Sir Nicholas Carter, said Russia is the greatest state-based threat to the UK since the Cold War.

I spoke with Nicky Campbell of BBC Radio 5 Live about the warning, explaining that it was far more than an appeal by the UK armed forces for more resources. The discussion considers the relative strength of Russian and UK forces, the “hybrid warfare” of the 21st century, and Russia’s challenge in areas such as Ukraine, the Baltic States, and the Middle East.

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