Ankara is drawing a hard line. If Kurdish forces participate in any strikes on Iran, Turkey says it will respond militarily. Immediately. No ambiguity. The US had apparently been floating plans to use Kurdish groups for operations in western Iran. Turkey killed that idea fast, seeing it as a direct threat to its own borders and a separatism risk it will not tolerate. Ankara didn't just warn Washington either. Kurdish groups got the message directly: get involved in anything against Iran and Turkey comes for you.