[perihelions]

These missiles are in outer space, at the altitude of the ISS or higher.

https://en.wikipedia.org/wiki/List_of_North_Korean_missile_t... (*old* ICBM tests, not today's one)

- There's no extant technology to shoot them down;

- They're not in Japanese airspace or territory (does not extend to orbital altitude);

- If they were to crash in Japan by mistake, there's no benefit in shooting at them, because they'd be untargeted debris with no warheads. An anti-missile missile is just additional debris with extra steps.