Thermal nuclear weapons are still Big Five exclusive. (I think India claim to have it, but the test yield is not conclusive)
North Korea’s test on 3 September 2017 could have been thermonuclear, too (BBC). Of course, even if true, that does not mean that they have successfully weaponized it yet. But North Korea being able to do that would lead me to updating the probability of other countries being able to develop thermonuclear weapons.
North Korea’s test on 3 September 2017 could have been thermonuclear, too (BBC). Of course, even if true, that does not mean that they have successfully weaponized it yet. But North Korea being able to do that would lead me to updating the probability of other countries being able to develop thermonuclear weapons.