Turkey is in Syria launching an offensive against the Kurds, and Iran just issued a warning for Turkey to back off. This confuses me - isn't it in Iran's interest for Turkey to suppress the Kurds? Why would Iran issue the warning?
Here's my flawed understanding of geopolitics in that region:
Both Iran and Turkey are competing for middle-eastern influence, both having (unspoken) ambitions to become the head of a new Islamic caliphate - as a successor of the Ottoman empire, or at the very least, a USSR or European Union alliance of Middle Eastern nations.
So yea, I know they aren't buddies.
Syria is Iran's partner, but Turkey is basically helping Syria by fighting the Kurds. Kurdistan extends into Iraq, Turkey, Syria, and Iran, and all four of those nations don't want Kurdish independence. Turkey fighting Kurds helps Syria and Iran both, since it reduces the amount of resources either of them need to invest on the Kurds, freeing up Iran to continue it's proxy war against Saadi Arabia in , and to continue consolidating influence in Iraq.
It also frees up Syrian resources to focus on its ongoing civil war, and frees up Iran's Hezbollah proxy army which is getting ready to harrass Israel in a mini conflict - perhaps with Hamas, which is also prepping for another Israel skirmish.
Syrian and Turkish relations, as far as I can tell, have gone down and up, up and down, but they don't view each other as enemies, despite some serious disagreements and diplomatic incidents between the two (each as shot down airships from each other in the past decade, but they've also held military manuevers together). Turkey, while condemning Assad's "brutality" on the rebels, has maintained support for Assad and refuses to call for him to step down. So Turkey isn't buddy-buddy with Syria either, and there's some distrust of Turkey, but they aren't enemies (like Iran and Turkey are).
So why doesn't Iran want Turkey to fight the Kurds, if it frees up Iran & Co resources during a time when it seems likely they'll need those resources for other conflicts active and brewing?
A semi-related subquestion is:
Why did Syria previously support/shelter the Kurdish PKK group?
What am I failing to understand?