Ukrainian and Red Cross officials are inspecting the contents of the 200-plus truck convoy, which Kiev fears could be carrying supplies or troops to bolster rebels.
A fleet of 280 Russian trucks allegedly carrying humanitarian aid is heading for eastern Ukraine, but the Ukrainian government and Red Cross say this isn't part of the agreement they reached.
Russia's ban on food and agricultural imports comes in retaliation for US and European sanctions over Ukraine. Russia is expected to release a full list of the products it is barring today.
At a UN Security Council meeting, Russia raised concerns over displacement in eastern Ukraine and called for greater aid to civilians. Critics say Russia is cloaking its true intentions in a conflict that it helped seed.
Amid a third day of heavy fighting, one member of the international team called the site 'one of the biggest open crime scenes in the world.'