Ukraine crisis: Rebels abandon Sloviansk stronghold

Pro-Russian separatists in Ukraine have evacuated the city of Sloviansk, a crucial eastern stronghold, amid a large-scale offensive by the military.

Separatists said the "overwhelming numerical superiority" of the army had forced them to relocate to Kramatorsk.

Troops have hoisted the Ukrainian flag over Sloviansk's council building, and officials said soldiers were mopping up the last outposts of rebel resistance.

Two smaller towns are also said to have been retaken by government troops.

David Stern reports.