
US national security adviser Jake Sullivan told CNN Sunday that while the Biden administration is “concerned about the possibility of escalation,” with respect to Russian President Vladimir Putin’s nuclear posture, “we have not seen anything that would require us to change our nuclear posture at this time.”
"We are watching this extremely closely, and obviously, 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,” Sullivan told CNN’s Dana Bash on “State of the Union.” “And the American President, Joe Biden, has to take that responsibility extremely seriously, even as we redouble our efforts to support the Ukrainians. 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.”
He also said that Russian strikes on Lviv, approximately 12 miles from Ukraine’s border with Poland, is a sign Putin “is frustrated by the fact that his forces are not making the kind of progress that he thought that they would make against major cities, including Kyiv, that he is expanding the number of targets, that he is lashing out, and that he is trying to cause damage in every part of the country.”