Crude oil cargoes worth some $400m have been exported from Libya by an obscure private company, in the latest sign of a breakdown of authority in the country. Blockades and force majeure stoppages at other oil facilities, along with the exile of a controversial central bank governor, threaten to plunge the country into an existential crisis. It comes as the compromises which have helped to contain civil conflicts since the fall of the Qadhafi regime look ever harder to sustain, writes John Hamilton