Eritrea, situated in the Horn of Africa bordering Sudan, Ethiopia and Djibouti, became a sovereign state after gaining independence from Ethiopia in 1993 following a 30-year war. The country is run by President Isaias Afwerki, who led separatist forces to victory in 1991 and has served as head of the People's Front for Democracy and Justice, the country's only legal political party, since independence.
Eritrea has not held a national election since independence, and a constitution ratified in 1997 has never been implemented. In 2001, the government shut down all independent newspapers after senior ruling party officials published an open letter calling for the constitution to be implemented and elections held.
The state is highly militarised, with a compulsory national service system requiring students to attend a military training centre in their final year of secondary school. After military training and political education, recruits may be assigned to military units or civilian roles that can last decades.
The repression and conscription have driven many Eritreans to flee, often at great personal risk. It is estimated that up to one-third of the Eritrean-born population now lives abroad.
The UK's threat to ban Eritreans over the returns dispute has not yet been formalised, but it underscores the tensions between European governments seeking to manage migration and the authoritarian state from which many asylum seekers originate.