He recently revisited that in FP magazine (https://foreignpolicy.com/2025/09/10/sanctions-paradox-russi...) arguing for keeping sanctions on Russia even though they clearly aren't going to coerce Russia into abandoning their war in Ukraine. The first reason is to re-enforce the global norm against territorial expansion. We've managed to go 80-odd years with a reasonable global norm against redrawing borders, and it is worth a lot to demonstrate that we- the global community- do not acquiesce. And the other reason is to weaken their economy for the grinding war of attrition that is currently happening, and not make territorial expansion easy for them.