The doctors 'breaking the siege' in Aleppo via Skype

The battle over Aleppo has been raging for more than five years - with the Syria city under siege for much of this time.

The medical and humanitarian situation is desperate.

Two years ago, British doctor David Nott got into Aleppo to help train doctors there. Now he's helping to get round the siege by directing life-saving operations via Skype. He spoke to BBC Newsnight.