Missile strikes on the port of Odessa have dimmed hopes for a UN-brokered deal to get Ukraine’s grain on the move. We ask what chances it may still have. Tunisia's constitutional referendum looks destined to formalise a march back to the autocratic rule it shook off during the Arab Spring. And how Formula 1 is looking to crack America. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer