The deal regarding the base was signed between Kurdistan Regional Government (KRG) President Massoud Barzani and Turkish Foreign Minister Feridun Sinirlioğlu, during the latter's visit to northern Iraq on Nov. 4.
At least 150 Turkish soldiers, accompanied by 20-25 tanks, were deployed to the area by land late on Dec. 4. For more than two years, Turkey has had a group of soldiers in Bashiqa, located 32 kilometers north of Mosul, which is under Islamic State (IS) control. The soldiers have been training the Peshmerga forces and other anti-IS groups.
Some 150 Turkish soldiers and 20 tanks were deployed to the base to take over the mission from the 90 soldiers who have been in the region for two years. With the increased number of Turkish soldiers deployed to the base, an increase is expected in the number of militia trained.
IS militants overran Mosul, a city of more than one million people, in June 2014, but a much anticipated counter-offensive by Iraqi forces has been repeatedly postponed because they are involved in fighting elsewhere.
A statement from the Iraqi prime minister's media office confirmed that Turkish troops numbering "around one armed battalion with a number of tanks and cannons" had entered its territory near Mosul without request or permission from Baghdad authorities. It called on the forces to leave immediately.
In a separate statement flashed on state TV, the Iraqi foreign ministry called the Turkish activity "an incursion" and rejected any military operation that was not coordinated with the federal government.
In Washington, two U.S. defense officials said that the United States was aware of Turkey's deployment of hundreds of Turkish soldiers to northern Iraq but that the move is not part of the U.S.-led coalition's activities.