In the early days of communism in Cuba, Fidel Castro had pledged that every child under seven would have a liter of subsidised milk every day. For some time, they did. But today, in the supermarket, it is also nigh impossible to find: milk has become the latest casualty in a long history of chronic food shortages in Cuba, as the island marks six decades of US sanctions. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES