Just think about it. A German Russian partnership would become a major rival to American Hegemony. German know-how and Russian resources. Can you imagine what a force they would become? From Americas point of view it must not happen. It has nothing to do with Putin in particular, its Russia period. It has everything to do with threats from potential rivals to American power. Nixon and Kissinger thought a China Russia alliance was a threat so did their best to keep them apart. Jake Sullivan, Anthony Blinken, and Brett McGurk are the unholy triumvirate you want to look into for US Foreign Policy decisions in recent years. They obviously thought pushing Russia and China closer together was a good idea for maintaining America's world hegemony. Pax Americana.

As long as American bases remain on German soil, you bet your boots on the ground Germany is beholden to Americas hegemonic wishes.