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Killer drones pioneered in Ukraine are the weapons of the future
(www.economist.com)
This is a most excellent place for technology news and articles.
Are you certain you're not thinking of the Sci-Fi Short Film "Slaughterbots"? The plot is almost exactly what you describe.
Apparently I'm an idiot. I saw a modified version, mixed in amongst other legit videos.
Here is an alternative Piped link(s):
Sci-Fi Short Film "Slaughterbots"
Piped is a privacy-respecting open-source alternative frontend to YouTube.
I'm open-source; check me out at GitHub.