Watch: UK agrees to protect Finland and Sweden if attacked (
Boris Johnson has promised the UK will not hesitate to protect Sweden if it was attacked by Russia, describing Vladimir Putin as a "21st Century tyrant".


Mr Johnson went on to sign a similar agreement with Finland - as both nations consider whether to join Nato.

The prime minister insisted the alliance was “more important than ever”.

But just how vital is Nato - and how might President Putin react to its expansion?
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