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Iran has been sanctioned for over 2 decades, I think all components are easy to find in the black market or to build, Iranian drones are probably the best bang for the buck in the entire world. Remember their attack on the Saudis a couple years back? Their missiles and drones made past two batteries of patriot.
Russia is probably worse than Iran at producing anything, they're corrupt as all hell with shitty quality assurance. >

The fact that Russia needs Iranian drone designs is hilarious.