The EU, Britain, Canada, and the U.S. all officially recognize the PKK as a terrorist organization (so essentially, all of NATO). It's really complicated though partly because there are different branches or wings of the PKK, not all of them militant. It's hard to say that every PKK member is a terrorist because some are only involved in peaceful activities. The PKK also fought against ISIL as did NATO, and I am sure there would have been cooperation and communication between them at that time.
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