Russian military chopper with five on board shot down in Syria

All five people on board a Russian military helicopter that was shot down over Syria on Monday are believed dead.

The Russian defence ministry said the military helicopter was shot down over the Syrian province of Idlib in what is the single most deadly incident for the nation since it entered the war.

"A Russian Mi-8 military transport helicopter was shot down from the ground in Idlib province after delivering humanitarian aid to Aleppo," the ministry said in a statement.

"There were three crew members and two officers from the Russian reconciliation centre in Syria on board," it said.

Video of the incident shows a small crowd milling around the mangled, burning wreckage of the chopper.

Kremlin spokesman Dmitry Peskov expressed condolences over the deaths of the five soldiers.

"As far as we know from the information we've had from the defence ministry, those in the helicopter died, they died heroically, because they were trying to move the aircraft away to minimise victims on the ground," he told journalists.

Photos shared widely on social networks by Syrian opposition activists on Monday purported to depict the smoking craft in the desert and personal belongings of those inside, including Russian drivers' licences, passports and insurance cards, as well as Orthodox Christian icons.

Another picture shows a man purported to be the pilot being dragged through the desert sand by his ankles. Another photograph shows the charred identity card of a blonde woman which was apparently recovered from the wreckage.

The authenticity of the pictures could not be independently confirmed.

The Monday downing brought the toll for Russian soldiers killed in the Syrian conflict to 18.

In the most recent death, contract soldier Nikita Shevchenko was killed in a mine blast in Aleppo province while accompanying an aid convoy, the ministry said on July 22.