US to loosen nuclear weapons constraints and develop more 'usable' warheads

[Anon-C]

4. Yes, but understand that technology was perfected in the 1950s.

I am saying there is some speculation that the US has pure fusion weapons. You do not require a fission implosion primary to initiate a fusion reaction, and indeed we've have billions in fusion research in the intervening seven decades. Most of that research is understood to be "dual use".

I understand if you don't want to follow that rabbit hole, suffice to say in stars, where fusion reactions occur in nature, they are initiated by massive heat and pressure. Scientists have attempted to do the same with magnetic fields, and high powered lasers, for a long time.