Armenian and Azeri forces fought new clashes on Friday, defying hopes of ending nearly three weeks of fighting over the Nagorno-Karabakh enclave, and US Secretary of State Mike Pompeo blamed Turkey for inflaming the situation by arming the Azeris, Reuters reports.
The worst outbreak of violence in the South Caucasus since Armenia and Azerbaijan went to war over the enclave in the 1990s, the fighting risks creating a humanitarian disaster, especially if it draws in Russia and Turkey.
Nagorno-Karabakh is internationally recognised as part of Azerbaijan but populated and governed by ethnic Armenians.
Turkey has increased military exports sixfold this year to its close ally Azerbaijan. Russia is close to both sides but has a defence pact with Armenia. News agency RIA reported the Russian navy had started planned military exercises in the Caspian Sea.
There were further signs on Friday that a Russian-brokered ceasefire agreed last Saturday to allow the sides to swap detainees and the bodies of those killed had all but broken down.
Armenia and Azerbaijan each accused the other of launching attacks, and each said it had the upper hand.
Armenian defence ministry official Artsrun Hovhannisyan said Azerbaijan had conducted artillery bombardments of Nagorno-Karabakh from the north, "with total disregard for the humanitarian truce". He added that Azeri forces had been repelled and had suffered significant losses.
Azerbaijan's defence ministry said Nagorno-Karabakh forces had been forced to retreat and Azeri forces retained the advantage along the line of contact that divides the sides.
Reuters could not independently verify these reports.
Baku also accused Yerevan of a missile attack on Ordubad in Nakhchivan autonomous province, a region which belongs to Azerbaijan but is surrounded by Armenia and Iran. Armenia denied such an attack.
The Nagorno-Karabakh defence ministry reported 29 more military casualties, bringing to 633 the number of servicemen killed since fighting broke out on Sept. 27. The region's ombudsman said civilian deaths now totalled 34.
Azerbaijan does not disclose military casualties. The Azeri prosecutor-general's office said 47 civilians had been killed and 222 wounded.