Kaelon warship

Star Trek: The Next Generation
Episode: TNG 196 - Half a Life

Two Kaelon warships, angular yet broad in design, were ordered to fire upon on the orbiting Enterprise when Dr. Timicin saught asylum on the starship. Timicin's culture demanded that at the age of 60, persons must commit ritual suicide. Timicin refused and decided to continue with his work instead.

Picard averted any altercation with the warships and Timicin returned to his people.