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BBC Security Correspondent Frank Gardner assesses the Riyadh talks' chance of helping facilitate a peaceful end to Syria's four-year civil war.
Djibouti's foreign minister, Mahmoud Ali Youssouf, speaks to Frank Gardner about the issues facing the region.
Frank Gardner examines what is being done to halt the threat posed by so-called Islamic State.
BBC Security Correspondent Frank Gardner assesses the terror threat to the UK and why it has been changed to severe.