Before China's transcension, it was indeed the German-Russian alliance that could encompass a territorial influence from Lisbon to Vladivostok a primary threat to the US.
From the US establishment point of view, it is better to keep the weaker Germany like a big blood bag for the US like Japan, and a weakened but rogued Russia keeps acting as the boogeyman that provides a reason for the US to stay and control Europe.
So they can focus their energy to tackle against China when both Europe and East Asia are in their thrall.