I am honoured to be given this opportunity to have the privilege of addressing such a learned audience, which facilitates my task by exempting me from indulging in details and particulars. However the topic is very delicate on the international level, since there are no concrete rules to depend upon. Taking in consideration the difficulty to cover all the points or problems related to the concerned subject, in such a limited time. Nevertheless, I am intending to try to raise the main issues of the topic in this paper.