Asked about reports that a helicopter had been shot down, the spokesman, Vladyslav Seleznyov, said, "Yes. It was brought down".
"There was a three-man crew, in all nine people (on board)," said Seleznyov.
Dmytro Tymchuk, a military analyst known to have good sources in the armed forces, said the helicopter had been brought down by a missile fired from a shoulder-held launcher.
He confirmed 9 people had been killed, according to preliminary information.
The incident took place just hours after pro-Russian separatists on Monday night announced a ceasefire until June 27 to match a week-long truce by government forces which has been ordered by President Petro Poroshenko.
The town of Slaviansk has been controlled by separatists since April and on May 30 rebels there brought down a military helicopter, killing 14 servicemen, including one general.
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