Nasser Kandil wrote: Why did not the Saudis send their army to Iraq instead of Yemen?

The question stems from the fact that the birth of ISIS in Iraq was ten months before the waging of Saudi Arabia its war against Yemen, and from the fact that the Americans who supported the war of Saudi Arabia on Yemen and justified the formula of the coalition which they formed for the war on ISIS wanted it an Arab Sunni alliance to prevent the sectarian strife.
What has been experienced by the Saudis on Yemen as planes, marines, and mechanisms and what they have spent of money would have made an important shift in the war on ISIS if the Saudi army went to Iraq.
The Iraqis who were targeted by ISIS were the Sunnis of Iraq whom Saudi Arabia claimed their support and claimed its fears for them from Iran and the Shiites of their country.
The scandal of the Americans and the Saudisis in the following:
They have betted on a sectarian strife in Iraq and the nonsupport of the Shiites of Iraq of their Sunnis brothers in the war on ISIS, just satisfied with fortifying their areas and protecting them, and in this case the Sunnis of Iraq will affiliate to ISIS.
They have betted on the long steadfastness of ISIS, because the Shiite and the Iranian participation will make the Sunnis follow ISIS, and that the giving up will last the steadfastness of ISIS.
They went to Yemen where there is no sectarian danger and no sectarian war despite their claims, because their main opponent is their ally of yesterday the President Ali Abdullah Saleh.
This reveals the plan of America and Saudi Arabia to prolong the presence of ISIS and to ignite the strife.
This reveals also that when they possessed the ability to wage a war they did not do that against ISIS,although they claim a war on terrorism and extremism.
If the Iraqis followed the plan of Washington, they would fight ISIS at the outskirts of Baghdad through paving the way for the withdrawal and not closing the crossings.
Iraq and the axis of the resistance have won, while the Americans and the Saudis were defeated even if they participate in the celebration of victory.