Up to that point, the Turkish delegation was determined to take Mosul back, but with the new development, it was forced to adopt a new strategy because the British deep state wasn’t hesitant about carrying out horrible massacres, and they were slaughtering in plain sight our people in Mosul, Kirkuk and Sulaymaniyah. The only way out seemed reconciliation.
Another important reason why Turkey didn’t risk war at Mosul and settled on reconciliation with the terms proposed by the British was the fact that Ankara had no air forces to fight the British air forces stationed in Iraq. After the war, Britain deployed its entire air force to Iraq. This also clearly demonstrated that Mosul was not a negotiable topic for Britain. However, it must be kept in mind that the Turkish side had just emerged from a ten-year of period of constant wars that included the Balkan Wars, WWI and the Independence War. Turkey, during those years, was a tired, battered and impoverished country struggling to remain strong amidst the ruins of the Ottoman Empire. Not only did it have no air force to defend itself, it had very limited military capabilities.
Furthermore, it should be kept in mind that, during the Lausanne talks, Istanbul was still under occupation. Under the circumstances, the Turkish side was clearly at a disadvantage with limited flexibility. All these factors forced the Turkish side to agree to a compromise on the Mosul issue.
Mustafa Kemal, until the time the Lausanne talks were suspended, said on many occasions that Mosul was a Turkish land and that he would ensure it stayed that way, by using military force if necessary. However, later he shifted his tone significantly. He began to say that it would be wrong to be persistent in Lausanne for the resolution of the Mosul issue and that it could be resolved later. One British intelligence report dated March 15, 1923 explains the reason behind this change of rhetoric. The report stated that in the next couple of years, not only Mosul, but Iraq, Basra, Arabia, Syria and possibly other Islamic countries, could unite under Turkish hegemony and that it would be done as the Islamic Union project and that the project had a high likelihood of success (SOURCE)
Islamic Union indeed will definitely happen, all Islamic countries will unite, the borders will be removed and even countries such as Russia, USA, Israel, China and all the other world countries will join this union. It will happen with the appearance of the Mahdi (pbuh) when all the sinister plots of the British deep state, the wars and conflicts end, when not even a single drop of blood is shed. Mustafa Kemal, no doubt, knew that time would come. He was aware that, sooner or later, Turks would get back the lands that once belonged to them. He was sure that, even though it didn’t happen at the time, it would happen with the coming of the Mahdi (pbuh). For this reason, he didn’t push the envelope and kept his hope alive with the dream of Islamic Union in his heart.