User blog comment:SuperNerd295/Gypsy or Gojira?/@comment-26283869-20150730232449/@comment-26383550-20150731111607

Godzilla enters burning state after absorbing nuclear energy. since Godzilla vs Destroyorah never said "nuclear bombs", it said that he absorbed radiation from the "normal explosives" that are fired at him all the time. compared to a nuke, a blast from a missle looks like a soda can explosion. So it is very likely that after being hit by a very large nuke that Godzilla would transform into his burning state.