If we want to be realistic, then if there was a nuclear explosion that big on planet Earth all the nations around it would be nuclear wastelands from the shockwave and fallout and the rest of the planet would probably be covered in ice from the nuclear winter.
Most nation states on that side of the planet would be gone and the ones on the other side of the planet would at the very least be collapsing from the fall in agricultural production and subsequent wars of desperation.
If we want to be realistic, then if there was a nuclear explosion that big on planet Earth all the nations around it would be nuclear wastelands from the shockwave and fallout and the rest of the planet would probably be covered in ice from the nuclear winter.
Most nation states on that side of the planet would be gone and the ones on the other side of the planet would at the very least be collapsing from the fall in agricultural production and subsequent wars of desperation.