months about how they're labs in ukraine developing chemical and biological weapons; that the u.s. is involved and they've discovered it and they've been making that argument for a period of time and it's the argument they usually make before they use that stuff themselves. does ukraine have biological weapons research facilities? >> no. we edo not assess that ukraine is pursuing either biological or nuclear weapons, which have been some of the basically the propaganda that russia is putting out. >> so, senator, the state department is warning they think russia is planning a biological or chemical attack. >> so, if we look at the history of russian action in syria, they haven't hesitated to be brutal, to escalate and to use increasingly lethal weapons, including chemical weapons used in syria against civilians.