In the battle against the so-called Islamic State, it is Kurdish fighters who have been responsible for the most significant victories.
Amongst their ranks, many consider the PKK to have been most effective. But, the group are also accused of being a terrorist organisation by Turkey - who started a bombing campaign against them in recent weeks.
The BBC's Jiyar Gol travelled to the PPK's mountain bases in Iraqi Kurdistan for an exclusive interview with the group's main leader, Cemil Bayik.

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