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Russians claim Ukranian forces are dropping booby-trapped chocolate bars on Russian trenches.
(imgur.com)
"Found these in the Zaporizhzhya direction. The enemy is throwing chocolates with an explosive mechanism. Do not open them under any circumstances. Our guy was lucky that it did not detonate, otherwise he could have ended up crippled. I know guys whose fingers were torn off like that."
It's an argument you could make, but there's already a convention against these specific types of weapon, even if you promise to be careful to clear them all when you're done.