Final answer:
The ICAO does not directly regulate aviation in all countries around the world.
Step-by-step explanation:
The statement in the question is False.
The International Civil Aviation Organization (ICAO) is a specialized agency of the United Nations that sets international standards and regulations for aviation. While the ICAO provides guidelines and recommendations, it does not directly regulate aviation in all countries.
Aviation is regulated by national civil aviation authorities within each country. These authorities implement and enforce the ICAO standards and regulations at the national level.