"Turkish officials say they will cross into northeastern Syria “shortly” with ground troops...

After President Trump’s threat to destroy the Turkish economy over the matter.....
Turkish officials are dismissing the US threats, with Vice President Oktay saying “Turkey is not a country that will act according to threats,.....
The US and Turkey have been sparring over the future of northeastern Syria for years. The US has wanted to ensure that the Kurdish YPG retains control of the area, while Turkey very much prefers that the Kurds not retain any autonomous territory..."

https://news.antiwar.com/2019/10/08/turkey-strikes-ne-syria-wont-bow-to-us-threats/

From what I had gathered, iranians and kurds don't like turks. An iraakie kurd I knew told me he was once turned down by a prostitute in turkey after she knew his identity.