The overall situation remained calm on the Nagorno Karabakh-Azerbaijan line of contact overnight on May 20-21, Karabakh Defense Ministry says.

However, Azeri troops used various caliber firearms to violate the ceasefire.

The Nagorno Karabakh Defense Army frontline units remained committed to the agreement and continue controlling the situation on the contact line.

The relatively calm situation, registered on the previous night on the contact line between Nagorno Karabakh and Azerbaijan was preserved overnight on May 19-20.