Lorries from a Russian aid convoy are streaming into Ukraine, without permission, after Russia accused Ukraine of obstructing it.
Russia's foreign ministry said Ukraine had held up the convoy in order to pursue war against rebels in Luhansk, where the aid is destined, reports GHN based on BBC.
The International Committee of the Red Cross (ICRC) said it was "not part of that convoy in any way".
Reports suggest the lorries are being escorted by rebel fighters.
"Our humanitarian aid convoy is starting to move towards Luhansk," the Russian foreign ministry said in a statement (in Russian).
Ukraine fears that the aid convoy of at least 260 lorries, which arrived at the border more than a week ago, is part of a broader Russian intervention in eastern Ukraine.
Russia denies accusations that it arms and trains the rebels in the rebellion in Luhansk and the neighbouring region of Donetsk, where four months of fighting have left more than 2,000 people dead and has caused more than 330,000 people to flee their homes.
The rebel-held city of Luhansk has been without running water, power and phone communications for 20 days as government forces hold it under siege.