Can I just take you to the specific objectives of NORAD, the raison d'ĂȘtre of NORAD, which is to surveil the skies, monitor and control? That's what NORAD has done for 65 years. It is constantly monitoring the skies for any of these types of objects. It just so happened that in the month of February there were four.
On March 7th, 2023. See this statement in context.