Alien encounters….

Does anybody know soemthing about AF intercepting alien crafts?
I only know two incidents with the Belgian AF and IRIAF ( Iran).

During some periode in the 90s 2 F-16 were scrambled to look for this craft ( after the people demanded it ). They never made it to visual contact, they only detected them with their radar.
They were suprised with the encredible speed of the craft, it went from 100 km/h to 1850 km/h in one second said a wingman.

The other was when a IRIAF commander was phoned in the middle of the night to get to the base immediately. After arriving at the base he went to his F-4E and scrambled. While engageing he said he felt he flew through a energy field, scared he made a lock on and wanted to fire a AIM-9 but it failed it didn’t launch. His controls went mad and he prepared for ejection. He pulled the ”ropes” but the seat didn’t eject after a while the craft went away and everything worked fine. I wonder why he just didn’t disengage?

Are there any other stories known?