Azerbaijan has said that the return of its lands is a necessary precondition for a peace deal to end three decades of conflict over the Nagorno-Karabakh region, which Azerbaijan retook in September.
Azerbaijan's border service said in a statement that it staged a "a revenge operation" in retaliation for a "provocation" it said Armenian forces had committed the day before.
Earlier this week, the World Jewish Center in Armenia’s capital, Yerevan, was vandalized.
Israeli officials have said that the arms relationship is partly due to Azerbaijan’s geographic proximity to Iran, a country that routinely calls for violence against Israel.
The mission is expected to continue over the coming days with plans in place for the arrival of additional teams from other hospitals next week.
The World Jewish Center in Armenia was vandalized. The attackers left a note saying "the Jews are the enemies of the Armenian nation."
Almost all the 120,000 or so inhabitants of Karabakh have since fled to Armenia, fearing for their safety.
Pope Francis called for talks between Armenia and Azerbaijan
In an exclusive interview, ambassador Arman Akopian describes the situation in Nagorno-Karabakh from his country's perspective.
Azerbaijan says it will respect the rights of ethnic Armenians who choose to stay, but that it has destroyed the concept of a breakaway state forever.