Let's agree to disagree, but we can certainly talk about this topic in another thread.
There are already reports that Turkey has also contacted Iran and Russia before this operation, and you don't really hear an opposing voice from Moscow or Tehran, unlike previous rumors last year about a no-fly zone in northern Syria which brought heavy criticism from both Iran and Russia. It seems, after the failed coup, many things have changed between Iran, Turkey and Russia, this maybe be the immediate result, but maybe we will see even more in future.
Iran has no interest to directly fight YPG in Syria as they are not a direct threat, but it also opposes any Kurdish state in northern Syria, naturally. We have enough enemies in Syria (ISIS, Nusra, Ahrar al-Sham, Zanki and a colorful list of terrorist groups), that's why fighting YPG is not a priority right now when they are not attacking us (or SAA) either.
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The best map for area around Jarablus for those who are not aware of the situation there:
HQ version