Was it the right decision? Shamima Begum, who left Britain to join ISIS, has lost an appeal against a decision that denied her the right to reenter her country of birth. Critics say this is bad news for thousands of other citizens.
ISIS bride loses UK citizenship, judge rules
Glossary
Turkey - Officially the Republic of Türkiye, a country that lies partly in Europe and partly in Asia at the east of the Mediterranean.
Syria - A Middle Eastern country that was the site of much of the fighting during the Crusades.
Islamic State - A terrorist organisation that captured whole swathes of territory in Iraq and Syria in 2014, and launched a series of attacks in Europe and North America. It is also known as ISIS or ISIL.
Home secretary - In Britain, they are responsible for national security, immigration and policing.
Groomed - When someone forms a relationship with a vulnerable person, especially a child, with the intention of later exploiting them.