Europe is considering its own nuclear deterrent, as trust in the US falters and fears of Russia grow. But a viable alternative to America's "nuclear umbrella" is far from obvious, as Alex Morgan explains. -------- More on Bloomberg Television and Markets Like this video? Subscribe and turn on notifications so you don't miss any videos from Bloomberg Markets & Finance: https://tinyurl.com/ysu5b8a9 Visit http://www.bloomberg.com for business news & analysis, up-to-the-minute market data, features,