There are both ML that is not AI, and AI that is not ML.

For example, if you pick them manually, decision trees can be AI but not ML. Video game character behavior is a trivial example.

Eliza for example is also not ML, but could be called AI.

Likewise, there is ML that is not AI. Such is debatable, because you could always argue that using machine-learning on anything results in intelligence. The way I see it, things like image enhancement or voice replacement are not artificial intelligence at all. I probably could not define a hard line where it becomes artificial intelligence though.