The cost to Iraq of this happening would be the immediate loss of $20bn. The US is able to threaten Iraq with the loss of 40 per cent of its foreign exchange reserves because Iraq's independence is still limited by the legacy of UN sanctions and restrictions imposed on Iraq since Saddam Hussein invaded Kuwait in the 1990s. This means that Iraq is still considered a threat to international security and stability under Chapter Seven of the UN charter. The US negotiators say the price of Iraq escaping Chapter Seven is to sign up to a new "strategic alliance" with the United States.

Bush is learning! He's progressed from fights to blackmail!

US issues threat to Iraq's $50bn foreign reserves in military deal - Middle East, World - The Independent