Around 70 Russian aid trucks have now entered Ukraine without permission from Kiev and the previously agreed escort of the Red Cross, Reuters reports.
An unnamed Ukrainian government official told the news agency: "The convoy started to move on its own, without consent from the Ukrainian side and unaccompanied by the Red Cross."
Russian President Vladimir Putin has reportedly been informed of the convoy's progress.
More top news
A slow start for most of us tomorrow with dribs and drabs of rain leaving some of us with a soggy journey into work.
If you're worried your online social circle is thinning out, a new browser extension will let you know who cut you loose online.
The Russian government has launched a campaign urging people to take safer selfies after after high-risk poses resulted in dozens of deaths.