They CLAIMED they had one. They did detonate a 60MT in the early 60s, but they eventually came to realize what we knew earlier: a bigger bomb doesn't equate with much more damage. EG: Five 1MT bombs do much more damage than one 5MT.
Ah, OK - hence why we goaded them with “one bomb for Russia”. We used to have smart people. I so hope there’s some kind of shadow government to these current loons.