Well, The wander earth 2 (WE2) actually has at least two covert plots. In the first elevator explosion scene, those missiles not only destoried the elevator, but also crashed the unfinished Ark space ship. Initially, there were 4 projects proposed in UN or UEG and one of them was the Ark spaceship project which could only carry 3000 persons to colonize a new planet. US was pro-Ark and pro-digital-life until the first iginition of planet engine. That explains why US was not so involved in the first half of the movie.

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Another covert plot is about MOSS. He is behind all of these crises and I think you already noticed that. But the movie also secretly depicted a hidden duel between AI and human. The restoration of Internet was actually finished 12 mins earlier than the final countdown (This was indicated by the time provided in the movie) and it was MOSS who faked the failure of restoration to either annihilate or test the human race. Zhou insisted an on-time iginition because he noticed that and forced AI to make a choice, either die together or live together.