Berlin's ejection of a US diplomat over spying allegations is threatening to sour relations between Germany and the US. Quentin Peel explains why Germans are so sensitive about surveillance, and how the spying furore may impact negotiations for a transatlantic trade agreement.

For more video content from the Financial Times, visit http://www.FT.com/video

Subscribe to the Financial Times on YouTube; http://goo.gl/vUQx5k
Twitter https://twitter.com/ftvideo
Facebook https://www.facebook.com/financialtimes