Armenia and Azerbaijan have traded blame on fire fight that erupted along the volatile border between the two arch-foes, with Yerevan saying four of its soldiers were killed in the southern region of Siunik.

The chief of Staff of the Iranian Armed Forces says the country is ready to contribute to lowering tensions in the Caucasus region, and send observers to the border regions between Armenia and Azerbaijan.

Armenians take part in anti-government protest in central Yerevan.

Russia says secessionist Armenian troops in the Karabakh region started giving up their arms to Russian peacekeepers.

Iran welcomes agreement by Azerbaijan and Armenian-backed separatists towards prevention of hostilities in Karabakh.

​​​​​​​Azerbaijan says it has launched "anti-terrorist operations" in Karabakh, almost three years after it went to war with Armenia over the disputed mountainous region.

Armenia's Foreign Ministry accuses Azerbaijan of preparing an escalation against Yeravan via the use of an “aggressive rhetoric” aimed at undermining existing agreements between both countries, adding that Baku is preparing for genocide of Armenians in the Karabakh region.