How long Britain could really fight for if war broke out tomorrow

Russia's full-scale war on Ukraine will soon enter its fifth year. Mysterious incidents of so-called "hybrid warfare" are mounting in Europe, increasing tensions. In the UK, military chiefs have warned we must prepare for war if we want to avoid it. But if the unthinkable happened, and war with Russia broke out, could the UK fight for more than just a few weeks?

The BBC's security correspondent Frank Gardner gives his assessment.

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