Top EU diplomat offers full support to Ukraine on visit to conflict frontline

Josep Borrell warns severe costs' would follow any aggression against Kyiv by Russian-backed separatists

The European Union's top diplomat has pledged full support" to Ukraine on a visit to the frontline of the country's war with Moscow-backed separatists.

Josep Borrell is the first EU high representative for foreign policy to have visited the Donbass region since war broke out nearly eight years ago.