First Nagorno-Karabakh War
For a while, Azerbaijan had enjoyed more military advantage than Armenia. For instance, Armenia had only three divisions and no airfields since, with Republic of Turkey, a NATO member, being its neighbor, the Soviet Union saw it a possible combat zone in case of a war. On the contrary, Azerbaijan had five divisions and five airfields; moreover, it had ten thousand railroad cars of ammunition, which was 20 times more than Armenia. To catch up with Azerbaijan in terms of weaponry, Armenia called on Russia for further shipments of weapons and Russia met the Armenian needs.