US Defence Secretary Chuck Hagel
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Europe must recognise Russian threat - Hagel

6 June 2014 Last updated at 01:37 BST

In an exclusive interview with the BBC, the US Defense Secretary Chuck Hagel said Russia's actions in annexing Crimea had united Europe and Nato, and given them a common purpose.

He spoke to the BBC's Katty Kay, and explained how much of a threat he believes Russia poses to Europe at the moment.