Let the Ohio (SSBN) release a volley.
24 missiles of 8,000nm range, and 12, 100kton independently targetable warheads. Each will hit within 10 meters of it's intended target. Nearly 3000 Hiroshima's on one boat.
We always keep a few at sea. Nobody knows where they are, but they know they're there.
No NATION would dare fire WMD at us. When SSBN's pull into port they open the silos to show everyone with eyes in the sky the missiles are there. They also know there's 3-5 of them at sea.