Five Russians on board a military helicopter were killed when itwas shot down by rebels in northern Syria, Russia has said.
The Mi-8 transporter came down in Idlib province. It was carrying three crew and two officers, Russia's defence ministry said.
The helicopter was returning from delivering humanitarian aid to the besieged city of Aleppo, it said.
It is not clear which group brought the helicopter down.
An alliance of rebel groups, including hardline jihadist factions, is the dominant power in Idlib.
Pictures on social media purportedly of the latest Russian helicopter downing showed burning wreckage and bodies, with armed men milling around.
Footage showed at least one body being dragged away. Another is seen apparently being trampled on.