US Senate Intelligence head on risk of Russian cyber-ops

The chairman of the US Senate Intelligence Committee has told BBC News it has been "the greatest surprise that Russia did not shut down the internet in Ukraine" or launch "a more massive cyber-attack against whether it be America or the West".

US senator Mark Warner told the BBC Hardtalk's programme Stephen Sackur while Russian cyber-operations was the "dog that hasn't barked" in the Ukraine conflict, the West should "keep shields up" for such a risk.

Watch the full interview on BBC World News, on Wednesday, 11, and Thursday, 12 May, or watch again on BBC iPlayer (UK only).

Find out more about the war in Ukraine.