The long civil war in Syria is still far from conclusion. Any real possibility of rebel victory ended with the entry of Russian forces last autumn — but while the initiative is now with the Assad regime, the government’s forces are also far from a decisive breakthrough. So who, if anyone, should the UK be backing in the Syrian slaughterhouse, and what might constitute progress in this broken and burning land?

It ought to be fairly obvious why a victory for the Assad regime would be a disaster for the West.