Ukraine rebels hinder border monitors as new armed columns appear

DONETSK Ukraine (Reuters) - International monitors deployed along the Russian border in eastern Ukraine say their drones were shot at and jammed days before new columns of unmarked soldiers and weapons, said by the West to be Russian, were seen in the rebel-held territory this week.

The reports by the Organization for Security and Cooperation in Europe (OSCE), which is seen as a neutral party in the conflict that has killed more than 4,000 people, come as Kiev and Moscow trade accusations of violating a fragile ceasefire.