Erdogan has also threatened to cut of oil flow from northern Iraq, saying,

“After this, let’s see through which channels the northern Iraqi regional government will send its oil, or where it will sell it,. Erdoğan’s meetings follow high-ranking military exchanges, including Iran’s chief of staff of the armed forces Mohammad Bagheri making an unusual trip to Ankara in August, followed by Russia’s top general, Valery Gerasimov.
Iran and Turkey have vowed that there may be military aggression if the result is independence.