A senior official in Kiev has accused Russia of invading Ukraine after Russian humanitarian aid lorries crossed the border without permission.
Russia began sending in its lorries, stranded at the border for more than a week, after formally accusing Ukraine of unreasonable obstruction, reports GHN based on BBC.
Valentyn Nalyvaychenko, head of Ukraine's SBU security service, said it was a "direct invasion".
The aid is destined for civilians in the east Ukraine war zone.
Reports suggest the lorries are being escorted by rebel fighters.
The International Committee of the Red Cross (ICRC) said it was not part of the convoy "in any way".
Russia's foreign ministry has warned Ukraine not to take any action against the convoy, without specifying the consequences.