The German electronics firm Hensoldt has a backlog of orders for its technology, including radars that protect Ukraine from Russian airstrikes. Meanwhile, Germany’s car industry is struggling with low European demand and competition from China. As Europe worries about how it can weather the economic and political turmoil unleashed by Donald Trump, executives from Munich and Düsseldorf say they have at least a partial answer. In January, Hensoldt offered to take on workers laid off by the car parts suppliers Bosch and Continental. The defence giant Rheinmetall made a similar proposal last year, and in February announced it would repurpose