"Documents from the archive of whistleblower Edward Snowden reveal wide-scale spying against Turkey by America's NSA and Britain's GCHQ. They also show the US worked closely with Ankara to battle Kurdish separatists." See the article:
“Documents from the archive of whistleblower Edward Snowden reveal wide-scale spying against Turkey by America’s NSA and Britain’s GCHQ. They also show the US worked closely with Ankara to battle Kurdish separatists.”
See the article: A Two-Faced Friendship: Turkey Is ‘Partner and Target’ for the NSA (Der Spiegel, link)
And see: Documents: NSA-Turkey (pdf)
Plus: How the NSA Helped Turkey Kill Kurdish Rebels (The Intercept, link)