Video footage, filmed on Friday, showed a crew from the news agency APTN, embedded with pro-Russian fighters as they attempted to capture Ukraine’s Donetsk airport.
The video shows a tank arrive at the frontline and be fired upon by Ukrainian forces..
A priority target for the separatists, the area around the airport has been the scene of fierce battles with the Ukrainian army in recent days.
Reports suggest the rebels stormed its two terminal buildings on Saturday only to be quickly repelled by government troops.
Ukraine’s military claims they have killed a dozen pro-Russian fighters over the past 24 hours, which would make it the worst casualty figure since a ceasefire officially began on September 5.
The footage shows rebels dragging the body of one of their colleagues to safety.
Ukraine accused Russia’s military of assisting separatists as they attempt to take the airport. If they succeed, it will be the second time since the begining of the crisis that they have taken the strategic infrastructure in the eastern city.
The rebels, in turn have accused Ukrainian government forces of breaching the truce.