► Subscribe to FT.com here:
An American fighter jet shot down a Syrian warplane over Isis-held province Raqqa on Sunday, prompting criticism from Moscow and the Syrian regime. Escalating tensions threaten to draw the US into the wider conflict.
► Subscribe to the Financial Times on YouTube:
For more video content from the Financial Times, visit http://www.FT.com/video
Twitter https://twitter.com/ftvideo
Facebook https://www.facebook.com/financialtimes
