Ukraine has expressed fears that Russia could use the aid shipment as cover for a military incursion in support of the separatists and threatened to use all means necessary to block the convoy if Ukrainian officials and the Red Cross were not allowed to inspect the cargo.
While the presence of the armoured vehicles near the aid trucks, about 30 kilometres from the border, was certain to cause some alarm, there also were possible signs that Ukraine and Russia have taken steps to ease the mounting tensions over the convoy.
The report said the cargo would be inspected in the presence of representatives from the Organisation for Security and Cooperation in Europe and would be received by the International Committee of the Red Cross.
It was unclear whether the roughly 200 Russian trucks would be allowed to enter Ukraine, a sticking point in the past.
In another effort to ease tensions, Russian emergency services officials allowed journalists covering the convoy to see the contents of trucks of their choosing. Among the supplies the journalists saw were bottles of water, sacks of buckwheat and portable generators.