possibilities that you've just described. i will say the use of nuclear weapons would be unconscionable by the russians. and that they should believe that and know that themselves, having just signed on as a member of the u.n. security council, a permanent member of the u.n. security council to a statement that said nuclear wars cannot be won and should not be fought, and we think they should live by those words. >> that's why it was outrageous toer what what the russian spokesman had to say yesterday. the biden administration has now formally, officially declared that russian troops have committed war crimes in ukraine. does the u.s. believe that designation will have any impact whatsoever on putin's >> reporter: wolf, this does not seem like a government, a president, a leader who is subject to shame, who is likely to alter his behavior in light of pronouncements like this, but it is very important regardless for the international community to stand for the proposition