Berlin Briefing: Facing the future: Germany's struggle with nuclear reliance on the US

Germany is famously "under the US' nuclear umbrella"-creating a dependency that some are now calling risky. What exactly does that mean? How would US soldiers and bombs help protect Germany in a worst-case scenario? What options does Germany have to move toward a European umbrella? And why is this context so relevant when assessing the current German recalibration of its international diplomacy?