“Bienvenue a Bamako!” The fixer, the minder and the men linked to the Malian government were waiting for us at the airport in Bamako. Polite, smiling – and watchful. It was late December, and we had just taken an Air Burkina flight from Dakar, Senegal across the Sahel, where a storm of political upheaval and armed violence has unsettled the region in recent years. Mali sits at the centre of a reckoning.