Can nations effectively parry ICBMs with anywhere close to 100% certainty? I assume ICBMs aren't created equal, and at a certain point you can presumably just t

Can nations effectively parry ICBMs with anywhere close to 100% certainty? I assume ICBMs aren't created equal, and at a certain point you can presumably just throw more volume at the problem and overwhelm defenses (depends on the economics of defensive systems vs ICBMs).