of security assurances to ukraine, in connection with the succession to the nonproliferation regime to russia at the time in 1994, that was a negotiated settlement part of the deal for ukraine, ukraine's decision to give up this nuclear inheritance. and it became part and parcel of the overall in nonproliferation regime. the damage it's done to ukraine today has far wider reverberations, and as david ignatius correctly pointed out, other countries are watching. i would add south korea and taiwan as well to that list. >> right. i was thinking if i'm south korea or if i'm taiwan, i think the lesson is we need to be nuclear as a capability, otherwise, this, too, could happen to us. >> right. because nobody wants an all-out