A Russian Mi-8 military helicopter crash-landed outside Klin, in the Moscow region, on 19 May at around 8 p.m. local time, the country's defence ministry said. The helicopter crew of three died of their injuries.
"The entire crew of the aircraft, consisting of three people, died during the crash of the Mi-8 helicopter," a spokesman for the emergency services said.
The search team found both flight data recorders at the crash site, the spokesman said.
"Both black boxes were discovered — a flight data recorder and an on-board voice recorder," he said, adding that both black boxes were in satisfactory condition.
Following the incident, a commission of the Russian Aerospace Forces' command was deployed to the scene.
No further details were immediately available.
The Mi-8 helicopter made a hard landing on Tuesday evening while performing a training flight some 20 kilometers (12 miles) from the city of Klin. The flight was being carried out without live ammunition. According to preliminary information, the crash could have be caused by a technical malfunction.