Ukraine crisis: The key role of the 'steel city' of Mariupol

The BBC's Rupert Wingfield-Hayes reports from the steel works in Mariupol in south-eastern Ukraine, where the owner of the steelworks is supporting the Ukrainian government.

A ceasefire is still holding around the city.

If there is an attack in the coming days or weeks, it is not clear how the population of Mariupol will react - roughly half are thought to be sympathetic to the rebels.