A leading member of the Stop the War coalition clashed with Julia Hartley-Brewer on talkRADIO, with our presenter accusing him of turning the interview into a protest rally speech.
Chris Nineham attempted to defend his group's apparent reluctance to protest Russian airstrikes in Aleppo, saying "We're Stop the War, not Start the War."
Nineham also said that Syrian leader Bashar al-Assad was perfectly willing to negotiate a way out of the five-year conflict, but Britain and the United States were holding up the process.
The interview got particularly tetchy when Julia asked Nineham "how many innocent civilians are you prepared to let die?" and questioned whether Stop the War would have supported peace talks with Adolf Hitler in 1945.
Earlier Nineham had vowed to 'oppose the West' and suggested his group only exists to scrutinise the UK and not foreign states - a claim which appears to be at odds with its huge demonstrations over the conflict in Gaza in 2014.
Listen to the full interview above