Armenia’s Defence Ministry said on Friday four of its servicemen had been killed and another wounded in shelling near the border villages of Sotk and Norabak.
Azerbaijan said Armenia had struck its positions across the border in the Kalbajar region using drones, wounding three servicemen.
The incident came a day after Armenia accused treaty ally Russia of “absolute indifference” towards attacks on its territory.
Armenia accused Azerbaijan of massing forces close to the border, and striking its positions using drones, mortars and small arms fire. Azerbaijan denied gathering forces, but said it was taking “retaliatory measures”.
Nagorno-Karabakh, internationally recognised as part of Azerbaijan but inhabited primarily by ethnic Armenians, has been a source of conflict between the two Caucasus neighbours since before the collapse of the Soviet Union in 1991, and between ethnic Armenians and Turkic Azeris for well over a century.
Despite sporadic discussions on a peace deal to agree on borders, settle differences over the enclave and unfreeze relations, tensions remain high and skirmishes along the shared border are a regular occurrence. Two days of clashes in September last year saw around 300 servicemen killed on both sides.
Continued fighting, along with a months-long blockade of Karabakh by Azerbaijan, have strained once warm relations between Armenia and Russia, which is Yerevan’s traditional ally, and which has a peacekeeping contingent in Karabakh.
