A Russia Ka-52 attack helicopter went down in Syria on May 7, both crew members aboard did not survive.
By Alex Beltyukov [CC BY-SA 3.0GFDL 1.2, CC BY-SA 3.0 or GFDL 1.2], via Wikimedia Commons
The Russia Ministry of Defense said the crash was due to technical issues. That was the first lost of a Ka-52 in Syria as well.