It called on all state and non-state actors to help create an enabling and non-restrictive environment to allow radio journalists to continue this important task.
A restrictive, or defining, relative clause modifies the meaning of its head word (restricts its possible referent), whereas a non-restrictive ("non-defining") relative clause merely provides supplementary information.
And why are they still investigating the effects of yo-yo dieting instead of non-restrictive approaches to eating and physical activity that are positive and sustainable?
In that sentence the phrase which bit the man is non-restrictive: it is merely providing background information about a dog whose identity is otherwise not in question.
