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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Due to how long the universe has existed, the chances of aliens being within 5,000 years of us technologically is close to zero. If they wanted us dead, we likely wouldn't know it until the planet exploded.