> I would say reentry is just as important to being a nuclear nation, it does you no good if your missile burns up on reentry.
A couple of points about this.
1. if you have a nuke, you don't need to do reentry to do massive damage to any modern country, if you explode it in low orbit, the EMP will do a lot of damage, very possibly more than if it were to go off at ground level.
2. 'reentry' is a slippery term to define.
It's pretty easy to make a solid object survive reentry if you don't care exactly where it hits, all you need is enough mass.
It's a bit harder if you want to have 'soft payload' like electronics or people survive reentry
It's a bit harder if you want to have guidence of your reentry capsule after reentry
But yes, every bit of effort that can make a better manned spacecraft can be used to create a better weapon.