It should be noted in this regard that while States have limited jurisdiction over their citizens residing abroad, this should be exercised with respect for the principles of sovereignty and friendly, including good neighbourly, relations. Moreover, the State of residence holds primary responsibility for the protection of its residents, including persons belonging to minorities, even though they may hold multiple citizenship, and should not discriminate against dual citizens. To avoid conflict of loyalties, a State can legitimately ask its citizens to rescind other citizenships before taking up high political positions such as Head of State or a member of government. 12. States may offer assistance to support education abroad, for example, with regard to textbooks, language training, teacher training, scholarships and school facilities. Such support should be non-discriminatory, have the explicit or implied consent of the State of residence and be in line with applicable domestic and international educational standards. Culture does not stop at State borders. Assistance and support in educational matters abroad can contribute in a constructive way to the development and the promotion of linguistic and cultural pluralism. States may express their interest in specific linguistic, cultural or ethnic groups living abroad by assisting them with cultural initiatives. This could include for instance the provision of textbooks, language training, teacher training, scholarships and school premises and facilities, support for libraries, museums, the arts and the like. Such support should wherever possible be provided by involving the authorities of the State of residence. With regard to textbooks, States should ensure that all educational materials, including those provided by other States, correspond to their domestic and international educational standards and provide a balanced picture that respects commonly accepted values of tolerance and a plurality of views and cultures. The UN Convention against Discrimination in Education (Article 5) stipulates, on the one hand, that education shall promote understanding, tolerance and friendship among all nations, racial or religious groups. On the other hand, it acknowledges that persons belonging to minorities have the right to carry on their educational activities without prejudice to national sovereignty. The importance of international co-operation in the field of education is recognized, inter alia, in the Hague Recommendations Regarding the Education Rights of National Minorities (Recommendation nos. 1-3) and in the 1989 UN Convention on the Rights of the Child (Article 28.3). The function of education to foster tolerance and intercultural 20 Recommendations on National Minorities in Inter-State Relations