For me, the sanctions aren't about stopping the current war, but about stopping future wars.
In your analogy...
Rusty doesn't know how to make a baseball bat. We supplied rusty with baseball bats because we thought he would use it to play baseball games. Instead he used it to threaten his class mates. We took that supply of baseball bats away from him because we can and don't want him to threaten Suzy like he did with Ursula. It doesn't matter to me what Rusty wants to trade to get those bats.
I don't supply bats or anything that can be traded to bats to Rusty in order to protect Suzy and I'll give Ursula whatever she needs to protect herself.
Sincerely,
Amanda