p.m. sikorski: ukraine should obey international humanitarian law, obviously.ould use our weapons to hit military targets. but when you say escalation, what you actually mean, nuclear weapons? the u.s. has read the riot act to putin along with china and india. other than that, tell me what putin is not doing that he could do if he gets really angry? i do not believe such a thing exists. geoff: what about crimea? as you well know, it was seized by russia decade ago. you suggested it be put under a u.n. mandate. why is that the right approach? ukrainian leaders say russia violated international law and should be held to account. p.m. sikorski: no, it was president zelenskyy who said perhaps ukraine will recover crimea through diplomatic means. we have an off the record hypothetical discussion of how that could be achieved. we support ukrainian sovereignty, the inviolability of borders. russia should get out of ukraine, including crimea. geoff: poland has been one of ukraine's staunchest supporters. how do you view poland's role in having -- helping ukraine recons