U.s. be explicit to say, you invade ukraine again, we will send u.s. forces. you invade taiwan, china, we will send u.s. forces. should the u.s. state that out loud explicitly? >> look, i think there is benefit in putting out sometimes in public what your red line is. so with ukraine, for instance, i think there is really benefit in saying, if russia uses nuclear, biological or chemical weapons on ukraine, that will lead to a nato reaction, because that's something that's far broader than just ukraine. that's the kind of thing that spreads around the world, not to mention, by the way, russia's...