How this conflict – played out in the rivalry between Iran and Saudi Arabia – is destabilising the world.
Just because there are no good options in Iraq doesn’t mean we have to pick the worst option.
Cameron will need Miliband's support to win a vote on military action. But all the signs are that he will get it.
The Foreign Secretary is meeting foreign leaders today to discuss plans to tackle extremist militants in Iraq and Syria.
The Islamic State video appears to show the killing of a third Western hostage, aid worker David Haines, and ends with the warning that another British person will be next.
Iraq, Libya, Syria, Nigeria, Afghanistan are all in danger of becoming black holes in which the nastiest groups can thrive. The only credible solution is to turn them back into proper countries.
David Cameron hinted that the UK will soon join the US in air strikes on Islamic State.
From Riyadh via London to Damascus, Baghdad and Isis – the jihadist surge.
There are severe limits to what the UK can do as a middle-ranking power. But it can do better than firefighting every crisis with an emergency meeting of Cobra.
Inhumane executions are not unique to the Islamist fanatics in Iraq and Syria.
The Prime Minister and US President have vowed against isolationism in the face of Islamic militants and the situation in Ukraine; will Cameron finally clarify Britain's stance on air strikes against Islamic State?