GCHQ head: Putin making strategic errors due to unconstrained power

British spy agency director to say in rare public address that Ukraine is turning the tide' against Russia

Vladimir Putin has made strategic errors in his pursuit of the war in Ukraine partly because there are so few restraints on his leadership, the head of the British spy agency GCHQ will say in a speech on Tuesday.

Russia's soldiers are running out of supplies and munitions and initial gains made by Moscow are being reversed, Jeremy Fleming is expected to add in a rare public address.