Only the US has used a nuke on another country. I don't think any superpower will ever use a nuke on another country, because the result would be worldwide extinction.
Now if a dirt farmer used a nuke on another country, I think that would be the rallying cry for all nations to pretty much wipe that country out. Whether it be North Korea, Iran, Pakistan, India, or Israel. That should be the indefensible crime in the world, that both the west and the red blocks should get behind.