This act applies sanctions and provides stabilization and security assistance in Lebanon. It gives the President power to impose sanctions on foreign persons supporting Iran's illicit financing or impeding Lebanese armed forces. Sanctions include blocking property, financial transaction prohibitions, and visa restrictions. Exceptions are outlined for humanitarian aid and intelligence activities. Stabilization efforts focus on humanitarian aid, reconstruction fund establishment, livelihood and scholarship assistance, and expanding Lebanese state services and political participation. The bill authorizes appropriations for security assistance to the Lebanese Armed Forces and the Internal Security Forces, aiming to counter Iranian proxy forces, disarm Hezbollah, and enhance state services. It also addresses safe return of Syrian refugees, diplomatic efforts, preventing fund diversion to Hezbollah, and disarmament of Hezbollah.