Why is Europe still dependent on the US for defense?

EU countries are expected to spend €454 billion on defense this year. But much of the technology Europe needs still comes from the United States. As joint European projects stall and governments buy American fighter jets, missiles and intelligence systems, does rearmament make Europe more secure or deepen its dependence on Washington?
 
DW speaks with security researchers Ian Lesser and Linus Terhorst about Europe’s fractured defense market, the future of NATO and what could happen if Europe were attacked while the US was focused…