Defence ministry says two servicemen were killed in the downing near the border with Azerbaijan that was caused by a man-portable defence system.
Russia has said one of its military helicopters has been shot down in Armenia near the border with Azerbaijan, killing two servicemen and wounding another.
The Russian defence ministry said in a statement on Monday that the Mi-24 helicopter was hit by a man-portable air-defence system.
Russia’s military base in Armenia is investigating to determine who was responsible for the downing of the helicopter, the statement added.
The announcement comes hours after ethnic Armenians in Nagorno-Karabakh confirmed the loss of the disputed region’s second-biggest city to Azerbaijani forces.
Armenian and Azerbaijani forces have been fighting for six weeks in the region of Nagorno-Karabakh, which is within Azerbaijan but has been under the control of ethnic Armenians since 1994.
More to follow.