More recently, however,Saudi Arabia put its Patriot defences to the test and found them severely lacking, with outright failures.

In repeated missile strikes from Houthi rebels using unsophisticated ballistic missiles, the Patriot missile failed, at times spectacularly. ...

4 NOV 2019

Saudi Arabia warms to idea of purchasing S-400s from Russia
Even though the kingdom’s possible purchase of missile systems from Moscow has been in the works for a few years, the country has not finalised a deal with Russia’s President Putin...
Saudi Arabia has long been considering the purchase of S-400 anti-aircraft missile systems from Russia. However, should it go ahead with this purchase, the United States is highly likely to protest.As Reuters reported two weeks ago: “Any progress on long-mulled Saudi plans to purchase the Russian S-400 surface-to-air missile systems would cause disquiet in Washington, which is sending 3,000 troops and additional air defence systems to Saudi Arabia.”The US has already reacted strongly to Turkey’s purchase of the S-400 missile systems by banning the country from purchasing F-35 fighter jets despite the fact that Turkey is not the only NATO ally with Russian technology that the US deems incompatible with its own.Saudi Arabia’s interest in buying Russian defence systems goes back at least two years, when the kingdom’s al Arabiya television reported that the country had agreed to buy the S-400. The announcement came during a visit by King Salman to Moscow on October 5, 2017.
https://www.trtworld.com/middle-east/saudi-arabia-warms-to-idea-of-purchasing-s-400s-from-russia-31098