UK spy agencies took their 'eye off the ball' over Russian interference and the government "badly underestimated" the threat, a watchdog has said.

A long-awaited report from parliament's Intelligence and Security Committee (ISC) found Vladimir Putin's administration has been engaged in "hostile foreign interference".

It criticised the 'illogical' approach by MI5 not to fully investigate how much Moscow tried to influence the Brexit referendum because of an 'extreme caution' of being seen to interfere in 'democratic processes'.

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