MoA—Azerbaijan, with its wealth of gas and oil money, had been able to arm itself with hundreds of drones from Turkey and Israel that allowed it to achieve air superiority. The Armenian defenders were not trained to sufficiently camouflage themselves from air threats. Their old air defenses were not capable enough to detect and defend against small drones. They therefore lost hundreds of tanks and artillery pieces to suicide drone attacks.
Azerbaijan, and the contingent of ‘moderate rebels’ mercenaries it had rented from Turkey, failed to invade the mountainous core of Nagorno-Karabakh. They lost several thousand men, many more than the defending Armenians, while trying to do that.