Ukraine

I mean, technically a grenade isn't meant to specifically kill, it's supposed to throw shrapnel in an area that can hit multiple enemies or enemies under cover. It's more of a utility explosive. If it so happens to hit the right spots to kill someone, that's awesome but the reason they are used is because they are so good at hitting a lot of shit in an area, The enemy will have a harder time fighting back full of shrapnel. Having a better engineered grenade can help it's probability of killing, but again, a grenade is just throwing shrapnel in a radius and hoping the people in the area are in the right path of the shrapnel to kill. The closer you are to the detonation site the more shrapnel you get hit with, so the more lethal it gets. To a point, if I remember correctly in us grenades the shrapnel doesn't go evenly around the grenade and the top where the pin is fairly free of shrapnel, so if you were directly overtop of it and it was standing straight up, your legs would be fucked, but your butthole wouldn't be entirely full of hot metal. So when you throw it and it lands on its side there's a chance that it wouldn't hit you depending on how far away you are and how close you are to the safe zone

My father, was hit by a grenade in Iraq so this happens to be something I know a little bit about. He was a combat engineer and survived the explosion, so I heard all about military explosives growing up.

But the Russian military uses f1 grenades, they are less powerful than what the US uses, but still very very deadly, coming in at like 270,000 joules.