EU wants to embargo Iran for the drone shipments to Russia.
https://www.aljazeera.com/news/2022/10/20/russia-iran-defiant-amid-un-pressure-over-ukraine-drones

Not sure how important those "kamikaze" drones are. I think I read various data on how many are them are neutralized by Ukrainian AA, and it is unknown how much pressure it puts onto the Ukrainian military and defense effort. Media prefers to report civilian casualties.

This article is severely biased (I like how it tries to depict a country acting in its own interests as sinister), but many nice crumbs of infos gathered together. Also to put things into geopolitical perspective.
https://theconversation.com/iranian-drones-used-by-russia-in-ukraine-show-that-theres-already-one-victor-in-that-war-iran-192780

I like this article better:
https://www.washingtoninstitute.org/policy-analysis/iranian-drones-russia-capabilities-and-limitations
How drone warfare will change? They are a great advantage, and can be even larger. Will more effective anti-drone measures emerge?