The escalation drew immediate international rebuke, with Russia accusing Baku of violating the brittle ceasefire and the European Union urging an "immediate cessation of hostilities".
The defence ministry of the Nagorno-Karabakh region said on Tuesday it had recorded another 35 casualties among its military, pushing its military death toll to 1,009 since fighting with Azeri forces erupted on Sept.27.
A Russian-brokered ceasefire between Armenia and Azerbaijan failed to hold on Sunday, with both sides accusing the other of intensive shelling of civilian areas.
With Russia’s mediation, Armenia and Azerbaijan agreed to a cease-fire in Nagorno-Karabakh starting at noon on Saturday following two weeks of heavy fighting that marked the worst outbreak of hostilities in the separatist region in a quarter-century.
Russia said on Saturday it would provide “necessary” assistance to Yerevan in its conflict with Azerbaijan over the breakaway region of Nagorno-Karabakh if fighting reached Armenia’s territory.
Armenian Prime Minister Nikol Pashinyan has formally asked Russian President Vladimir Putin to begin “urgent” consultations on providing security amid a conflict with Azerbaijan, the foreign ministry said on Saturday.
New clashes broke out between Azerbaijan and ethnic Armenian forces over Nagorno-Karabakh a day after talks in Washington to try to end the deadliest fighting in the mountain enclave in more than a quarter of a century.
As fighting over the disputed region enters its second month, international mediators are scrambling to bring a stop to frontline clashes and shelling of civilian areas that have left hundreds dead.
Azerbaijan and ethnic Armenian forces clashed in several areas of Nagorno-Karabakh on Friday, hours before talks were due to start in Washington to try to end the deadliest fighting in the mountain enclave for over a quarter of a century.
Armenia’s foreign ministry said on Friday it was ready to engage with the Organization for Security and Cooperation in Europe (OSCE) to re-establish a ceasefire in Nagorno-Karabakh, where fighting has been raging since Sunday.