They also have many of the pipelines that send oil/gas from that region to Europe. Hence the hand wringing and platitudes from the West rather than actual help. Aliyev knows this.
https://en.m.wikipedia.org/wiki/Southern_Gas_Corridor
And when Armenia had the gall to even hint at trying to break from under Russia's thumb to the West, Aliyev got the ok from Russia to teach them a lesson.
Azerbaijian took Artsakh/Nagorno-Karabakh 8 days later, in spite of a prior Russian security agreement to prevent exactly that.
F16s.
https://www.reuters.com/world/turkey-will-back-swedens-nato-bid-if-us-keeps-promise-f-16-sale-erdogan-2023-09-26/
Which is yet another reason why the West will hang Armenia out to dry.
Turkey already endorsed a corridor between the two countries through the south of Armenia, immediately after the attack on Artsakh, literally 4 days, while 100,000 Armenians were fleeing.
https://www.reuters.com/world/azerbaijani-turkish-leaders-hold-talks-eye-forging-land-corridor-via-armenia-2023-09-25/
Why would Armenia open this corridor voluntarily? Azerbaijan already pinky swore Artsakh wouldn't be attacked. Erdogan knows how this will be solved, and it won't be pen and paper.