The US risks amplifying the message that IS and similar groups have been trying to spread for years.
The war in Syria is made of several smaller wars that sometimes run in parallel and sometimes cross over, like railway junctions on the express to hell.
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 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.
The most crucial of all decisions – to go to war – must not be left in the constitutional and procedural shadowy shambles it currently is.