supported they say by the united states in the territory of ukraine. that's something that both the ukraine and the u.s. deny. they say, no, the opposite is happening. that's what they're worried about. the fear that putin could deploy chemical weapons is real. >> what are nato allies saying? >> they're very concerned about it. this is an escalation where russia was talking about u.k. facilities. we spent much of last week being concerned about the rachetting up of tensions surrounding whether or not russia believes nato might get involved by helping give arms to ukrainian soldiers, planes to ukraine. we saw all of that talk of poland putting its mig planes ukrainian pilots can fly at the disposal of ukraine. the united states decided not to do that. they didn't want to, if you like, poke the russian bear on