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The front line has moved since 2014 so it's possible. And while raising a "who would" argument, you forget about the same question for the UAV version — who would send an UAV to drop a grenade in a random village 30 km from front line?
This case is pretty clear as for media coverage — there is no evidence for any drone attack, it's just a doubtful hypothesis, which didn't prevent Russian media from spinning it with the sole intention of inciting hatred.