> For me one of those would be to deny someone food and water from my own surplus.
That attitude puts you in an abusive relationship. Reminds me how my brother would ask me for money to pay for his next car loan installment, and when I would help him, he would spend his money on entertainment.
Or like in situational jokes in comedies: two guys order a beer, guy A drinks a beer. Guy B wants to drink a beer, but is stopped by guy A: "this is mine beer, yours was the one I already drunk".
In other words, Russia has the resources to feed its people. But if Russia decides to spend the resources on building nuclear warheads, we shouldn't help its citizens with food.
And yes, I'm aware it's less about giving the food for free and more about selling it. But there are other resources than money: if Russia is unable to secure food for itself, this is because the government has diverted attention (being another resource) to something else like military efforts.
We're not sanctioning a small, heavily populated island. To the contrary. Russians have a lot of time to prepare food reserves.