Every major and strategic defense acquisition of Saudi Arabia is supervised by the US. Even your Saudi-Sino projects.
https://en.wikipedia.org/wiki/Royal_Saudi_Strategic_Missile_Force
In 2013, media reports appeared suggesting that the RSSMF would consider purchasing the advanced DF-21 ballistic missile from China in the future.[16][17] In January 2014, Newsweek revealed that Saudi Arabia had secretly bought a number of DF-21 medium-range ballistic missiles in 2007. They also said that the American CIA had allowed the deal to go through as long as the missiles were modified to not be able to carry nuclear warheads. While the DF-3 has a longer range, it was designed to carry a nuclear payload, and so had poor accuracy (300 meters
CEP) if used with a conventional warhead. It would only be useful against large area targets like cities and military bases. This made them useless during the
Gulf War for retaliating against Iraqi
Scud missile attacks, as they would cause mass civilian casualties and would not be as effective as the ongoing coalition air attacks.
After the war, the Saudis and the CIA worked together to covertly allow the purchase of Chinese DF-21s. The DF-21 is solid-fueled instead of liquid-fueled like the DF-3, so it takes less time to prepare for launch. It is accurate to 30 meters
CEP, allowing it to attack specific targets like compounds or palaces. The Saudis are not known to possess mobile launchers, but may use some 12 launchers originally bought with the DF-3s. The number of DF-21 missiles that were bought is unknown. Newsweek speculates that details of the deal being made public is part of Saudi deterrence against
Iran.
[15][18][19]
and why ICBM and not missile with the range of less than 4,000KM
:
