The case concerns Danish authorities’ decisions to deprive a dual national of his Danish citizenship and to deport him, following conviction for receiving training with ISIS. This was found to be compliant with Article 8 ECHR. The Court reasoned that deprivation of nationality was not arbitrary, that there had been sufficient opportunities to appeal, and that the crime in question, terrorism, was a serious one that endangered human rights. The punishment of deprivation of nationality was found to be proportionate. The Court also found that deprivation of nationality in this instance did not result in impermissible consequences as it did not render the applicant stateless.
Five applicants of dual nationality, convicted in 2007 of participating in a criminal association in a terrorist context, were stripped of their French nationality in October 2015 by Prime Minister decrees. The Court held that the decision to forfeit the applicants’ French nationality did not have a disproportionate impact on their private lives and therefore was not in violation of Article 8 of the Convention.
The applicant's Ukrainian nationality was withdrawn rendering him stateless, and subsequently a travel ban of 3 years was imposed on him due to a procedural violation of the border crossing rules. The applicant argued that the travel ban is disproportionate, that he enjoys lawful residence in Ukraine, has very close ties with Ukraine, and that the ban interferes with his right to challenge the deprivation of nationality which rendered him stateless in person in court.
The applicant was born in the US, and his birth certificate indicated a Polish national as the father, and an unknown surrogate mother as the mother. Polish authorities refused to confirm the applicant acquired Polish nationality at birth as a child of a Polish parent, because the birth certificate is against the Polish public order, in particular the prohibition of surrogacy. The courts ruled in favour of the applicant, stating that confirmation of his Polish nationality on the basis of the birth certificate does not amount to validation of surrogacy.
The applicant acquired Austrian nationality in 1995 and renounced her former Turkish nationality in 1996 as a condition for retaining the Austrian nationality. In 2018 the Austrian authorities declared that she has no longer been an Austrian national since 1997 as it appeared that she voluntarily re-acquired her Turkish nationality at that time, which is a ground for automatic loss of Austrian nationality. The Court set aside the determination of loss of Austrian nationality as it did not carry out a proportionality test on the basis of the Tjebbes judgment.
The applicant was born in Poland to a Vietnamese mother. When she was 9 years old a Polish citizen formally recognised her as his daughter, and the local authority subsequently confirmed that she is a Polish citizen by birth. She was growing up as a Polish citizen until another 8 years later the central government authorities invalidated the confirmation of nationality by the local authority, as according to the Polish Citizenship Law changes in parenthood can only lead to acquisition of Polish citizenship if they take place within 1 year of birth. The applicant's arguments related to article 8 ECHR, best interests of the child, as well as long-term presumption of Polish citizenship due to no fault of the applicant, although the court dismissed all arguments.