This person claims the HQ-20 isn't even an ABMD due to its radar configuration
He made a detailed thread on this but in Persian
If true, I bet it's from Pakistan.Ukrainian military shot down a Russian Kh-101 cruise missile with the help of a FN-6 MANPADS.
My bet is UAE, as they had a history of importing and exporting such weapon system.If true, I bet it's from Pakistan.
Aliexpress
Edit: In all seriousness, FN-6 is like Type-81, or HJ-8. One of those widely proliferated weapons at this point, could be purchased anywhere. Rebel groups use them all the time.