In June, Commonwealth heads of government will meet in the Rwandan capital Kigali, a city advertised by their Tutsi host, the 63-year-old Paul Kagame, as ‘the Davos of Africa’. Kagame, Rwanda’s de facto leader since 1994 — and boasting more honorary degrees than Barack Obama, although he never finished high school — has become the ‘donor darling’ of the international community.