Prior to the 1991 war, the Americans promised Israel that in the event of a Scud attack, U.S. aircraft would concentrate on knocking out the Scuds within the first 48 hours. However, as explained by Moshe Arens, who served as Israel’s defense minister at the time:
The problem of hitting mobile launchers was far more difficult than the U.S. had envisioned. Although there was intensive aerial activity directed at hitting the Scud launchers, not a single Scud launcher was hit or immobilized during the five weeks of the Gulf War.Today, senior American officials are not promising to destroy Hizbullah Scuds; they are denying that they’re in Lebanon.
Then the Americans sent over the Patriots. The Patriot was probably the most advanced anti-aircraft missile around at the time, and was advertised as also having anti-missile capability. As it turned out, the Patriot missiles in Israel did not succeed in intercepting a single Scud missile.
After all, such a deployment would be a serious violation of UN Security Council Resolution 1701 which prohibits the “supply of weapons to any entity in Lebanon without the consent of the Government of Lebanon.” (This raises the question of whether Lebanon’s government, cowering before a resurgent Syria, agreed to the Scud deployment. If so, that makes Lebanon, its military, and infrastructure complicit and fair game in the event of another war.)
via pajamasmedia.com