The Israeli military has expressed concerns to its political leaders about a potential sale of advanced fighter jets to Saudi Arabia. The warning comes as the United States signals its intention to move forward with the sale, which could include dozens of state-of-the-art aircraft. The development coincides with diplomatic efforts to improve relations between Saudi Arabia and Israel, and a planned visit by the Saudi crown prince to Washington. Israeli officials fear that such a sale could undermine their country's longstanding air superiority in the region.