Isis pushes Iraq to the brink

Isis’ lightning offensive has pushed Iraq to the brink of outright civil war and a return to the murderous sectarian bloodshed that nearly tore it apart in 2006. President Obama is considering limited military intervention to take on the terrorists but only if there are signs that Nouri al-Maliki, Iraq’s Shia prime minister does more to reach out to moderate Sunnis and Kurds. Geoff Dyer, US diplomatic correspondent, Roula Khalaf, foreign editor, and Guy Chazan, energy editor, join Ben Hall