As Saudi Arabia sends troops into neighbouring Bahrain to quell unrest, will the "Arab Spring" fail to take hold in the world’s largest oil-producing country? and has London become too close to the world’s less savoury autocrats and oligarchs? In the chair, analysis editor Frederick Studemann debates the issues with FT colleagues David Gardner, international affairs editor, James Blitz, defence and diplomatic editor, and tax correspondent Vanessa Houlder.