Ukraine says may block Russian aid convoy

A Russian convoy of trucks carrying humanitarian aid for Ukraine sets off from near Moscow in this still image taken from video August 12, 2014. REUTERS/Reuters TV

KIEV/MOSCOW (Reuters) - A Russian convoy of trucks carrying tonnes of humanitarian aid left on Tuesday for eastern Ukraine, where government forces are closing in on pro-Russian rebels, but Kiev said it would not allow the vehicles to cross onto its territory.

Kiev and Western governments warned Moscow against any attempt to turn the operation into a military intervention by stealth in a region facing a humanitarian crisis after four months of warfare.