What Song Heping found most troubling now wasn't the SA-9 missile system's origin, nor was it the small details like transportation and payment.
The SA-9 missile systems had been left behind by the former Illiguo government army, and Yusuf's material department was certainly aware of their whereabouts. The key issue was that any high-value military equipment, such as aircraft, anti-aircraft missiles, tanks, and other large items, were under military supervision, which meant additional control by the United Security Council.
And Peter had already insinuated that he could ensure that his own arms business would operate smoothly within Illiguo. That is to say, Peter had tacitly allowed him to secretly purchase arms from the material department.