acquire. If a person already lost Dutch nationality under these three exceptions prior to 1 April 2003, the final date to regain Dutch nationality under these three exceptions was 1 April 2013. Since then, it is no longer possible to reacquire Dutch nationality by option under these three exceptions if the person had already lost Dutch nationality prior to 1 April 2003. The only way to regain Dutch nationality is by naturalisation. These exemptions do not apply in the case of acquisition of Austrian, Norwegian or Danish citizenship. Before 28 April 2008, those exemptions did not apply to obtaining Belgian nationality. Before 10 July 2009, these exemptions did not apply to getting the Luxembourgeois nationality. This is due to the provisions of the Convention on the Reduction of Cases of Multiple Nationality, to which the Netherlands became party in 1985. Other exceptions also exist such as the one in which minors who naturalise independently from their parents will not lose their Dutch citizenship. That was particularly helpful prior to 1985, when the age of majority was 21. The exemptions lead to internal problems in the case of acquisition of Japanese or South Korean citizenship since neither Japan nor South Korea allows its nationals to hold foreign citizenships in their adult years (though limited exceptions exist in South Korea, and Japan requires renunciation of the foreign citizenship within two years). They are strictly Japanese or South Korean internal affairs and have to be solved by Japanese or South Korean citizens themselves, according to the laws of their own country. They are not problems of the Dutch state, and all that the Dutch laws say in this respect is that such Dutch nationals with dual nationality are allowed to renounce to their Dutch nationality. Dutch nationals are not allowed to renounce their nationality if they become stateless so this renunciation has to occur while they have dual nationality, which is illegal in Japan and South Korea. Therefore, acquiring Japanese or South Korean nationality cannot be done by exempted Dutch nationals without breaking the laws of such countries. Each sovereign state decides for itself who are its citizens, and other states are not allowed to intercede on behalf of individuals in such internal affairs. By deprivation Dutch citizenship by naturalization may be withdrawn if procured by fraud or if the naturalized Dutch national does not renounce a foreign citizenship as per the requirements