The latest humanitarian truce in Upper Karabakh, or Nagorno-Karabakh, an internationally recognized territory of Azerbaijan, came into force last Saturday.
Relations between the two former Soviet republics have been tense since 1991, when the Armenian military occupied Upper Karabakh.
Four UN Security Council resolutions and two from the UN General Assembly, as well as international organizations, demand the withdrawal of Armenian forces from the occupied territory.
In total, about 20% of Azerbaijan's territory – including Nagorno-Karabakh and seven adjacent regions – has been under illegal Armenian occupation for nearly three decades.