Since Egypt, Iran, and Israel have signed but not ratified the Comprehensive Test Ban Treaty (CTBT), they agree to the goal of prohibiting the testing of nuclear weapons. As a building block towards the establishment of a weapons-of-mass-destruction-free zone (WMDFZ) in the Middle East, they could jointly or concurrently ratify the CTBT, thus creating a de facto nuclear-test-free zone in the region that Saudi Arabia, Syria, and Yemen could join. This could act as a confidence-building measure and facilitate the participation of these states in the activities of the CTBT Organization (CTBTO), which verifies compliance with the test ban.