This article from New America has some interesting numbers on top drone sellers, byers and their relationships. Including a mapping of global import and export relationships. I think it dates from 2022?
TOP SELLERS
The United States and Israel are the biggest producers and sellers of drones.
(...)
Israel is the largest exporter of drones in the world. Israel accounted for 41 percent of all drones exported between 2001 and 2011, according to a database compiled by the Stockholm International Peace Research Institute (SIPRI), though Israel refuses to release the full list of countries to which it has sold military arms.
(..)
China is a growing drone exporter and has filled gaps in the market with its more liberal export policy.
Israel exports to 56
USA exports to 55
China exports to 37
Austria exports to 13
France exports to 11
Canada exports to 5
Germany exports to 5
Iran exports to 5
Estonia exports to 4
Turkey exports to 4