Yeah, or a stealth plane can just drop a regular missile or guided bomb at close range where it is too late for defenses to react.
The current idea is for F35’s to drop SDB’s or similar from 30-60km or so, too far to be detected, or at least locked-on.
SDB fits in the F35 internal bay.
Yeah probably the biggest threat is a nuke in space that can be just dropped and depend on gravity. Just a falling nuke with no propulsion just a kinetic delivery. No way to stop that.