Abd al Malik, 41, a Yemeni, was sent to resettle in a peaceful nation, Montenegro. He received a government stipend for a time after his release in 2016, but that ran out. He tried to raise funds by selling artwork he made at Guantánamo, but made his last sale last year. An ambition to work as a driver and guide there never materialized as the tourism-dependent economy tanked. And now he, his wife and 20-year-old daughter are isolated and mostly at home because of the coronavirus pandemic.