"The aircraft crew comprised Russian nationals - the commander and a second pilot, as well as Ukrainian nationals - the flight engineer and the navigator. They all died," Ruslan Madiyev said.
He said there were 11 people on board, including three high-ranking officers from Burundi.
The Il-76 owned by the Aerolift airline with cargos for Somalia-based Ugandan peacekeepers fell down for unknown reasons into Lake Victoria and sunk soon after departing from Entebbe International Airport on Monday.
Madiyev said Russian Ambassador Sergei Shishkin and military attache Alexei Yegorkin are in the airport finding out the details of the crash.
A total of 3,500 servicemen from Uganda and Burundi making part of the African Union contingent are based in Somalia.