One person was killed and several were wounded in clashes between rival Ukrainian demonstrators in the eastern city of Donetsk.

The young man was stabbed to death in violence between pro-Russian and pro-European demonstrators.

It was the worst unrest since the Moscow-backed president Viktor Yanukovich was ousted last month and pro-Russian forces seized Crimea.

Donetsk, like Crimea, is a mainly Russian speaking city.

The young man was stabbed to death in violence between pro-Russian and pro-European demonstrators.

Tensions are at fever-pitch as diplomatic efforts intensify ahead of Sunday's vote....in a country divided and on the edge of war.

In an unusually emotional speech, German Chancellor Angela Merkel warned of "catastrophe" unless Moscow changes course.