economically. ukraine, on the other, hand has the unified support of the whole western world. and much of the world beyond the west as well. but that support, as hardening as it may, be it is no shield from the brute force and steal of the russian military. 44 million citizens of ukraine who are in the crosshairs of that military right now. should tell, you we just got late word tonight that president biden will in his address this evening announce that the united states is closing its airspace to russian aircraft. major step to be announced by president biden tonight, this of course follows the lead of the european union and canada who have already taken measures like this. state of the union addresses all have their own trauma. their own occasionally miller dramatic political backups. but this one, this is a deeply challenging time for an american president to be addressing our country. just a moment, we will talk with white house chief of staff, ron klain.