Faced with a newly aggressive Russia, NATO leaders on Wednesday outlined a muscular new vision that names Moscow as the military alliance’s primary adversary but also, for the first time, declares China to be a strategic "challenge.”

It was a fundamental shift for an alliance that was born in the Cold War but came to view a post-Soviet Russia as a potential ally, and did not focus on China at all.

But that was before Feb. 24, when Russian forces poured across the border into Ukraine, and Chinese leaders pointedly did not join in the global condemnation that followed.