NATO Secretary-General ​Mark Rutte called on Tuesday ⁠for ⁠a "transatlantic defense industrial revolution" ​and urged ​companies ⁠to take more risks with their investments.

"The hum of machinery must become a roar," Rutte told the NATO Summit Defense Industry Forum in Ankara ahead of a gathering of the alliance's leaders in ⁠the Turkish capital.

"Industry across all of the ​nations represented here must ​be ready ⁠to ‌take ‌more risk. The ⁠demand is ‌there, and ​you know ⁠it."

Rutte's remarks came as allies started to reveal large-scale defense investment pledges at the industry forum, including an initiative to spend $40 billion on the alliance's drone defense capabilities.

"NATO is rapidly expanding our ability to deploy and operate drones at scale. And at the same time, we are building robust counter-drone defenses to detect, identify, and neutralize drones," said Rutte.