Here’s a page from the International Red Cross site that shows that US and Turkey have failed to ratify many parts of international law that would protect the world from wars of agreesion that we are witnessing in northern Syria.
Here are copies of the documents that relate to War Crimes conventions that based on the above chart, Turkey has ratified.
GC-I-EN
GC-II-EN
GC-III-EN
GC-IV-EN
IHL-60-EN Hague convention 1954
IHL-61-EN Hague convention protochol
IHL-86-EN Child Convention 1989
IHL-96-EN Additional Child protochol 2000