.."Some former Iranian military sources were quoted elsewhere as saying that the country can produce around 20 drones a month, which is well short of Russian’s needs."..
www.iranintl.com UK Suggests Russia Will Look For More Iran Drones The United Kingdom defense ministry said Wednesday that Russia had used hundreds of Iranian-made drones in Ukraine but none since around November 17.
Does that add up with the number of drone attacks being reported by Ukraine?