*Positive signals from Iran over nuclear deal put west in a tricky position.* https://www.theguardian.com/world/2022/dec/20/positive-signals-from-iran-over-nuclear-deal-put-west-in-a-tricky-position

I suggest dropping sanctions against Iran, then inviting it to decide whether to continue arming Russia (and face sanctions for that) or stop arming Russia (and continue without sanctions).