Ukraine conflict at 'turning point'- US ambassador

The American ambassador to Ukraine has said the recent escalation in fighting in the east could constitute a "turning point" in the conflict.

Speaking to the BBC's David Stern, Geoffrey Pyatt laid responsibility for the increase in violence directly with Russia, which he said was supplying separatist forces with heavy artillery and fighters.

Mr Pyatt said the immediate international efforts will be concentrated on defusing the situation.