Iraq has told Turkey to “immediately” withdraw forces, including tanks and artillery, it has deployed in the country’s north without Baghdad’s consent, the office of the prime minister, Haider al-Abadi, said on Saturday.Turkish media reported that about 150 Turkish soldiers backed by 20 to 25 tanks had been sent by road to the Bashiqa area north-east of Mosul, the city that is Islamic State’s main hub in Iraq.
turkey has deployed armor and troops to capture the city of mosul in iraq despite never being asked or obligated to. iraq believes turkey is invading to secure a supply route for oil from CIA/prevent coalition forces (especially kurds) from taking the city from CIA. turkey assures iraq it is to provide reinforcement for their effort against CIA.
http://rudaw.net/english/kurdistan/051220152note: evidently the turkish forces are there in support of the peshmerga kurdish forces in a training role. northern iraq is de facto under kurdish governance so if the kurds have requested turkish assistance it's hard to call this an invasion.