SAVICKIS AND OTHERS v. LATVIA JUDGMENT II. INTERNATIONAL LAW AND PRACTICE A. Nationality 1. The case-law of the International Court of Justice 70. In the Nottebohm Case (Liechtenstein v. Guatemala, judgment of 6 April 1955, ICJ Reports 1955), the International Court of Justice (ICJ) concluded as follows. “It is for Liechtenstein, as it is for every sovereign State, to settle by its own legislation the rules relating to the acquisition of its nationality, and to confer that nationality by naturalization granted by its own organs in accordance with that legislation. It is not necessary to determine whether international law imposes any limitations on its freedom of decision in this domain. Furthermore, nationality has its most immediate, its most far-reaching and, for most people, its only effects within the legal system of the State conferring it. Nationality serves above all to determine that the person upon whom it is conferred enjoys the rights and is bound by the obligations which the law of the State in question grants to or imposes on its nationals. This is implied in the wider concept that nationality is within the domestic jurisdiction of the State. ... According to the practice of States, to arbitral and judicial decisions and to the opinions of writers, nationality is a legal bond having as its basis a social fact of attachment, a genuine connection of existence, interests and sentiments, together with the existence of reciprocal rights and duties. It may be said to constitute the juridical expression of the fact that the individual upon whom it is conferred, either directly by the law or as the result of an act of the authorities, is in fact more closely connected with the population of the State conferring nationality than with that of any other State. Conferred by a State, it only entitles that State to exercise protection vis-à-vis another State, if it constitutes a translation into juridical terms of the individual’s connection with the State which has made him its national. ... Naturalisation is not a matter to be taken lightly. To seek and to obtain it is not something that happens frequently in the life of a human being. It involves his breaking of a bond of allegiance and his establishment of a new bond of allegiance. It may have far-reaching consequences and involve profound changes in the destiny of the individual who obtains it. It concerns him personally, and to consider it only from the point of view of its repercussions with regard to his property would be to misunderstand its profound significance. In order to appraise its international effect, it is impossible to disregard the circumstances in which it was conferred, the serious character which attached to it, the real and effective, and not merely the verbal preference of the individual seeking it for the country which grants it to him.” 2. The European Convention on Nationality 71. The principal Council of Europe document concerning nationality is the European Convention on Nationality (ETS No. 166), which was adopted on 6 November 1997 and came into force on 1 March 2000. It has been 22