Defence giants are drawing battle lines as Germany rearms, with the old guard arguing for traditional heavy weaponry while start-ups push for more modern kit such as AI-enabled drones.

Chancellor Friedrich Merz has vowed to create Europe's strongest conventional army with outlays of hundreds of billions of euros, accelerating a build-up that began after Russia's 2022 full-scale invasion of Ukraine.

The rush to rearm, mirrored across Europe, has been fuelled by pressure from US President Donald Trump for NATO allies to spend more on defence as well as worries about American commitment to the continent's security.

But where these funds should flow is hotly debated.

A crop of German tech defence start-ups argue the Ukraine war -- much of it now contested in the skies with unmanned aerial

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