French President Emmanuel Macron has denied reports of CIA warnings regarding a possible Russian drone operation. The alleged warning concerned a potential attack targeting southern Europe. Macron has made a pledge to send military assets to protect a key site in Saudi Arabia's energy infrastructure, known as the Yanbu site.

Further details about the situation are available from the source. The denial of CIA warnings and the pledge to send military assets are the key points known at this time.

The Yanbu site is a crucial component of Saudi Arabia's energy infrastructure, and its protection has been pledged by Macron.