"'At the same time, this conflict might be a war for oil. Why? Because the central government wants to show its displeasure with the KRG exporting oil without the knowledge of the Iraqi government,' Erdogan further said . . . ."
""TURKEY STUDIES PAST TREATIES TO JUSTIFY CLAIMS TO OIL FIELDS IN NORTHERN IRAQ . . . " is from a few years before our troops entered Iraq in 2003. And note that Turk studies looked for valid reason that could be justified before the world's legal opinion. They found none if I remember other news items correctly.
Today it's the Kurdish region's oil and Turkey has established economic relations with the KRG to help -- and benefit from -- the export of the oil.