Iraq is looking at purchasing the S-400 surface to air missile system from Russia, and the US is threatening sanctions:

Having suffered two decades of US-led bombing campaigns, terrorist insurgency and sectarian violence, Iraq is now trying to protect its airspace. But the US threatens to slap it with sanctions if it buys Russian missile systems.

Baghdad has recently expressed interest in purchasing Russia’s advanced S-400 surface-to-air missile defense systems. However, if Iraq goes forward with the plan, it faces a dilemma: the US could potentially retaliate with sanctions under the Countering America’s Adversaries Through Sanctions Act of 2017 (CAATSA).

“We want to purchase any weapons that will strengthen the security of Iraq and the country’s armed forces. At the same time, we respect regional and international commitments,” Iraqi Foreign Minister Ibrahim Jaafari told RIA Novosti on Wednesday. “There are a number of obstacles on the path [of buying] S-400 systems. The Iraqi side is still negotiating, and when the final decision is made, it will be considered,” Jaafari added.

According to State Department spokesperson Heather Nauert, Iraq has already been warned that purchasing S-400 systems could violate CAATSA, which imposes sanctions on countries which purchase weapons from Moscow.

As confirmed by this official State Department Briefing, it appears that the US foreign policy apparatus has been become little more than a lever to sell US weapons systems.