There is currently a high possibility of a Russian war against Ukraine, that could even extend to Poland and the Baltics. Further, military actions and protests in Kazakhstan raise the possibility of losing safe use of the Baikonur Cosmodrome by Russian cosmonauts and Progress cargo flights for some period of time.
Therefore, it would be wise for NASA Administrator Bill Nelson to develop contingency plans to continue to operate ISS, the International Space Station in the event of any loss of cooperation by Roscosmos, or during a temporary Russian loss of access to Baikonur.
If there are such contingency plans, perhaps developed at the time of the 2014 Russian invasion of Ukraine, they should be updated to include the capabilities of SpaceX's Dragon and Boeing's forthcoming Starliner for crew transport and reboosting.
By themselves, contingency plans could help deter a Russian leap to war, as one bit of leverage the Kremlin may threaten to encourage U.S. acquiescence to Russian military goals in Ukraine could be to obstruct the continued operation of ISS.
There are of course a great many contingency plans for every possible emergency on ISS. Let's add or update one more to assure continuity of operations no matter what happens in the coming months in Ukraine. And if there is no crisis, we would be better prepared should the need arise in the future.