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In page Iran–Iraq War:

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By 1990, Iran was undergoing military rearmament and reorganization, and purchased $10 billion worth of heavy weaponry from the USSR and China, including aircraft, tanks, and missiles. Rafsanjani reversed Iran's self-imposed ban on chemical weapons, and ordered the manufacture and stockpile of them (Iran destroyed them in 1993 after ratifying the Chemical Weapons Convention).[citation needed] As war with the western powers loomed, Iraq became concerned about the possibility of Iran mending its relations with the west in order to attack Iraq. Iraq had lost its support from the West, and its position in Iran was increasingly untenable.[1] Saddam realized that if Iran attempted to expel the Iraqis from the disputed territories in the border area, it was likely they would succeed.[2]