require

demand, claim, require, exact mean to ask or call for something as due or as necessary.

demand implies peremptoriness and insistence and often the right to make requests that are to be regarded as commands.

claim implies a demand for the delivery or concession of something due as one's own or one's right.

require suggests the imperativeness that arises from inner necessity, compulsion of law or regulation, or the exigencies of the situation.

exact implies not only demanding but getting what one demands.