not only from sullivan but also president joe biden and others. the u.s. would stand by article five and attack on one nato ally is an attack on all of nato. he was also asked about nuclear posture. has the u.s. nuclear posture changed in light of russian actions, for example, vladimir putin saying that he's put his nuclear forces and his strategic forces on a higher level of alert. here was his answer there. >> the escalation risk with a nuclear power is severe and it is a different kind of conflict than other conflicts the american people have seen over the years. as things stand today, the united states has not adjusted our nuclear posture but it is something that we monitor day by day, hour by hour, because it is a paramount priority to the president. >> reporter: he also talked about the issue of china and whether china would be a way to avert sanctions. emif he thought china could do that, they have another thing coming. he said look, russia probably