KYIV, Aug 10 (Reuters) - Ukrainian President Volodymyr Zelenskiy said he discussed a drone deal and food security with Saudi Crown Prince Mohammed bin Salman on Monday. "There are domains in which Ukraine and Saudi Arabia can strengthen each other's ability to protect lives and people," he said on X after the call. Ukraine and Saudi Arabia signed an agreement on military cooperation in March when the president met the crown prince. Ukraine has developed expertise in dealing with Iranian-designed drones over more than 4-1/2 years of war with Russia. It has also signed deals on drone development with other countries in the Middle East and Gulf and elsewhere.