The provisions of this Part, except in so far as they apply in relation to designated overseas missions, are intended to assist in giving effect, on the part of Australia, to the special duty imposed by international law on a state that receives a diplomatic or special mission, or consents to the establishment of a consular post, to take appropriate steps to protect the premises of the mission or post against intrusion or damage, to prevent any attack on the persons, freedom or dignity of the personnel of the mission or post and to prevent disturbance of the peace, or impairment of the dignity, of the mission or post.