Why is Germany taking a big stake in a major tankmaker?

The German government will buy a 40% stake in tankmaker KNDS. The deal is as much about control in the critical defense sector as it is about the Franco-German relationship.

source https://www.dw.com/en/why-is-germany-taking-a-big-stake-in-a-major-tankmaker/a-77687784?maca=en-rss-en-ger-1023-rdf