MOSCOW — A convoy of 280 Russian trucks reportedly packed with aid headed for eastern Ukraine today, but Ukraine said it would deny the mission entry because it has not been certified by the Red Cross and could be a covert military operation.

The International Committee of the Red Cross said it had no information on what the trucks were carrying or where they were going. That has raised fears in Ukraine and the West, where leaders have voiced concerns that Russia could use the initiative as a pretext for sending troops into the territory.

Russian television and news agencies reported that 2,000 tons of aid was en route to Ukraine, where fighting between pro-Russian separatists and government forces has claimed more than 1,300 lives since April.

Pro-Kremlin television channel NTV showed hundreds of white trucks gathered at a depot outside Moscow, and said they were carrying everything from baby food to sleeping bags. The report also showed a Russian Orthodox priest sprinkling holy water on the trucks, some of which bore a red cross, before their departure.

But Andriy Lysenko, a spokesman for Ukraine’s National Security and Defense Council, said the convoy will not be allowed across the border.

“This convoy is not a certified convoy. It is not certified by the International Committee of the Red Cross,” Lysenko said.

He also showed a covertly filmed video appearing to show vehicles similar to the white-canopied trucks dispatched from Moscow parked at a military base in Russia. One frame shows uniformed troops lined up in front of one of the trucks.

French President Francois Hollande took up the issue with Russian President Vladimir Putin, saying “he emphasized the strong fears evoked by a unilateral Russian mission in Ukrainian territory.”