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A mouse that a cat is playing with gets a bite in, once in a while.
It only takes one bite - precisely in the balls.
That's why the cat only plays with the mouse that he isn't ready to kill, yet. However, the cat usually devours the head first, and the female mouse doesn't even have balls.
So, thank you for understanding that Russia is way stronger than Ukraine, and maybe stronger than the combined military of the West.