“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.”
Yes. Very much so. Just poison in general is a war crime, let alone hiding it in chocolate.
https://ihl-databases.icrc.org/fr/customary-ihl/v2/rule72