Is assimilated to residence in France when such residence constitutes a condition for the acquisition of French nationality:
1° The residence outside France of a foreigner who carries out a public or private professional activity on behalf of the French State or an organisation whose activity is of particular interest to the French economy or culture;
2° Residence in countries in a customs union with France that are designated by decree;
3° Presence outside France, in peacetime or wartime, in a regular formation of the French army or under the obligations provided for in Book II of the National Service Code;
4° Residence outside France as a national service volunteer.
The assimilation of residence that benefits one of the spouses extends to the other if they actually live together.