Otherwise, strategies have to be developed and compared to give them access to the nationality of their country of birth and habitual residence in order to avoid that statelessness will be transmitted to further generations. In many European countries this is in particular important for Roma, Sinti, Travelers (and other national minorities). Also, with respect of these issues an expert meeting should be organized to develop guidance how to deal with this type of cases. v. Further guidance was considered necessary to be developed in respect of birth registration, taking into account the distinction be made for birth registration of persons born in the country and those born abroad. - - For persons born in the country - member states should be encouraged to implement the principles enshrined in Recommendation 2009/13 of the Committee of Ministers on the nationality of children (in particular principle 23), and states should be consulted whether further guidance should be developed on this issue. For persons born abroad without having a birth certificate but living in a member state of the Council of Europe, guidance should be developed to establish under which circumstances the state of residence shall issue a birth certificate. Several states have rules on this, and the experienceexchanges could be shared with other member states. vi. The necessity to review practices and develop guidance regarding deprivation of nationality for national security purposes, should also be explored, in particular in the light of recent case law of international courts . vii. Finally, experts agreed that there was a need for improved data and statistics on stateless populations/ persons of undetermined nationality in order to inform policies aimed at eliminating statelessness, through joint efforts of relevant organisations. INTERNATIONAL CONFERENCE 24 September 2021 51. The International Conference organised on 24 September 2021 served as a platform for exchange of good practices and experiences, including in the area of identification and protection of stateless persons, prevention and reduction of the risk of statelessness in Europe and prevention and reduction of childhood statelessness, as well as related topics. Participants were invited to: ▪ Take stock of outstanding challenges and achievements in addressing statelessness in Europe and define concrete action and commitments by member states, in line with their obligations under the relevant international Conventions towards addressing statelessness in Europe. 18