Iraq Might Cancel Security Agreement With U.S

The Iraqi Parliament's Security Defense Committee is calling for a review and the cancellation of Iraq's security agreement with the U.S. After the security agreement is canceled they'll then request Russia which will be quite eager to fill the void, to help them battle ISIS.

I don't know if that wouldn't be a good thing for the U.S. Regardless of who is helping the Iraqis fight terrorist I believe that the war will never end and the U.S should leave as soon as possible so less of the tax payers money is wasted.

How much money has the Iraq war cost the government?

http://www.reuters.com/article/us-iraq-war-anniversary-idUSBRE92D0PG20130314
The U.S. war in Iraq has cost $1.7 trillion with an additional $490 billion in benefits owed to war veterans, expenses that could grow to more than $6 trillion over the next four decades counting interest, a study released on Thursday [2013] said.

How much more should be spent?