Estimates vary but it seems the current sanctions include a carve-out allowing Russia to sell $0.8-$1 billion USD per day in oil and gas. I can assure you that a significant portion of these funds is being used by Putin’s regime to wage this war.

I also think it is silly to argue that cutting Russia off from this direct subsidy from the west would be insufficient to have chilling effect on Putin’s war - especially when we haven’t even tried. How do you know it is insufficient?