Authorizes Member states, seven days after the adoption of this resolution, acting nationally or through regional organizations or arrangements, to take, under the authority of the Security Council and subject to close coordination with the Secretary-General and UNPROFOR, all necessary measures in the airspace of the Republic of Bosnia and Herzegovina, in the event of further violations, to ensure compliance with the ban on flights referred to in paragraph 1 above, and proportionate to the specific circumstances and the nature of the flights;