I personally think Russia bc their gov is sketchier than a pair of Skechers on a pedo , China bc they might enslave them or North Korea bc it's fvcking North Korea ლ( ಠ_ರೃ)
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They wouldn't care. If aliens arrive to Earth their goal is not to meet humans and become friends so we can enrich our understanding of the universe together; their goal is to either subjugate or exterminate humans and reappropriate what resources they can from the planet.