AskHistorians

He was the head of the government which replaced the one which negotiated the Treaty of Sevres. Effectively, once Ataturk caused the Treaty of Sevres to be scrapped, as a whole, Western interest in the notion of an independent Kurdistan faded. Much of that land Turkiye was unwilling to give up, plebiscite or no plebescite, and a major reason for Kurdistan, by the calculations of the Western powers, was to weaken Turkiye - something which the Turks were not particularly willing to accept once a treaty not-at-gunpoint was being negotiated.

The interests of the Kurdish people themselves, naturally, were ignored in these calculations. No friends but the mountains...