With the likely aim to aid their embattled Islamic State (DAESH) puppet allies and consolidate the (Washington and Tel Aviv promoted) "Hornets Nest", under threat of extermination by the joint Russian and Syrian offensive, Turkey has sent troops to Mosul District, an area under DAESH control but disputed by Kurdish militias.
Iraq has demanded the immediate exit of the Turkish invader force but this request is likely to be ignored by Erdogan's unbearable cynicism.
Ankara claims that it is just "an incursion" and that they are there "to train Iraqi troops". What "Iraqi troops" might those be (if at all)? Only those of the Islamic State.
The most obvious aim of the attack is probably to set a barrier between DAESH and Kurdish forces, which might otherwise take control of Mosul, the second largest city of Iraq and a key hub in the oil smuggling business of the DAESH and the Erdogan clan.
This mafioso-terrorist association of the Ankara regime and the DAESH puppet of the Pentagon has been denounced for a long time in the alternative media but only recently, after Turkey downed a Russian jet in a calculated act of war, the usually reserved Moscow government has provided strong evidence of this association. Iraq has also denounced the illegal trade and I guess this is yet another reason for Erdogan pushing it within the frail Iraqi borders.
What can happen? Well, Iraq has let clear that they do not want US "boots on the ground" within their borders no matter what, pretexting that Shia militias had threatened to kill them but actually because they do not trust Washington nor their semi-autonomous protectorates (Tel Aviv, Ankara, Riyadh) at all. This underlines the alignment of Iraq, a major oil producer (second only to Saudia before the troubles began), with Iran, Russia and China, something that surely is not taken lightly in Washington nor in Ankara.
Russia had pondered to extend their air operations into Iraq, while China did openly offer its air forces to Baghdad last year in order to fight DAESH. Recently China also signed a military base agreement with Djibouti, located at the strategical Bab-el-Madeb strait, near Yemen, and which also holds a French naval base. So the whole region is each day resembling a mini World War scenario, in which the Western Empire (NATO-plus) is clearly not afraid of provoking its Eurasian rivals into greater intervention, nor these seemingly coy about replying with a "bring it, cowboy", sorta.
Nevertheless I think that a likely development will be the destabilization of Saudia and Turkey themselves, because the Eurasian allies must know that only playing a defensive "cold war" is not enough, that Washington and their satellites must feel the pain themselves, else they will never be brought to any sort of semi-good faith negotiation or understanding. As Sun Tzu said: in order to win the war, take what the enemy values most.