I propose to make missile defense in the form of shooting heat traps, which may with a high probability to reject missiles from the course, something like:
And also in the form of a jammer, protecting a certain area, deflecting the missiles from the course, but with a lower chance, for example 50%.
PD I propose to remake in anti-aircraft gun or a machine gun that would fire on drones (if they will be in the future) and on enemy ships as a full-fledged weapon.
