"We always think of war as something that happens to other people." The siege of Sarajevo started 30 years ago this week. Zlata Filipovic was amongst the Bosnian children who witnessed the atrocities in their hometown. Her solace was the diary in which she wrote about living through the longest siege in modern history. A letter to Ukraine from Sarajevo: https://bbc.in/3uVFBkf | BBC World Service