Realpolitik I guess. They want to destabilize the USA, and we want open weights we can run on our own machines. As long as those interests coincide, we are allied.
The best outcome for us is the one where they all keep competing and undermining each other until the end of time while providing us all with better models and cheaper hardware to run them with. The US corporations in particular should never be allowed to achieve their "you'll buy intelligence from us on a meter" rent seeking dream.