Footage recorded by a drone flown over Debaltseve in eastern Ukraine by charity fund Army SOS has emerged, showing damaged buildings and evidence of shelling.

The Ukrainian president says his forces are making an "organised" withdrawal from the town.

Petro Poroshenko said 80% of Ukraine's troops left on Wednesday morning after several days of fierce fighting.

Russia said Ukrainian forces had tried to fight their way out of the city after being encircled, but Mr Poroshenko insisted they were never surrounded.