Russia’s use of an experimental hypersonic missile to hit Ukraine was a “terrible escalation” in the war, German Chancellor Olaf Scholz said on Friday, renewing calls for “prudence” vis-a-vis Moscow.

Axar.az reports that, citing France Press, the deployment of the new weapon showed “how dangerous this war is,” Scholz said in a speech.

“That Putin has now also used a medium-range missile to strike Ukrainian territory is a terrible escalation,” he said.

As one of Ukraine’s biggest supporters, it is important for Germany to work with allies “to do what prevents an escalation in this war to a war between Russia and NATO,” Scholz said.