What event eroded Israel's belief in the credibility of the U.S. to prevent Iran from acquiring nuclear weapons?

Question

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The U.S. failure to use force against Syria after the Assad regime used chemical weapons against civilians, despite having previously declared such use a "red line," significantly eroded Israel's trust in the U.S. commitment to preventing Iran from acquiring nuclear weapons. This inaction raised doubts about the U.S.'s willingness to enforce its red lines and take decisive action in the Middle East, directly impacting Israel's security concerns regarding Iran's nuclear ambitions.

What Event Eroded Israel's Belief in the Credibility of the U.S