The United States recently committed itself to arming the Kurdish People’s Protection Units, known as the Y.P.G., to help evict the Islamic State from its Syrian stronghold, Raqqa. This decision is likely to prove deeply troublesome, risking the regional stability necessary for the lasting defeat of the Islamic State.
The Y.P.G. denies that it is, in effect, a wing of the Kurdistan Workers’ Party, or P.K.K., but the evidence is clear. The P.K.K., a Marxist-leaning Kurdish nationalist organization, was founded in Turkey in 1978, and took up arms against the Turkish state in 1984. The group’s leader, Abdullah Ocalan, was expelled from Syria in 1998, when his old patron, the regime of Hafez al-Assad (Bashar’s father), came under military threat from Turkey. Mr. Ocalan was soon arrested by the Turks, and the tide of war turned against the P.K.K.