putting american forces, nato forces in ukraine. reporter: a frenzy of activity this week. national security official holding classified briefings with congressional staffers on the situation in ukraine. we re working all member briefings for the house and the senate in the coming days. reporter: american citizens in ukraine including nonessential staff at the u.s. embassy urged to leave the country. the u.s. prepares to share its concerns with russia in writing. and a warning from the department of homeland security that if provoked, russia could launch a cyber attack against the u.s. broadly, we are always preparing for any action that related to cyber or any other activity that any country could take. reporter: the president in close consultation with world leaders. we re all on the same page. we have to make it clear that there s no reason for anyone, any member of nato to worry whether or not we, nato works come to their defense. reporter: it continues with
Robertson in moscow, russia. let s start with mj lee at the white house. the thinking on whether he should send u.s. forces into eastern europe or even into ukraine. i ll be completely honest with you. a little like reading tea leaves. reporter: president biden on high alert as tensions continue to sim order the russia-ukraine border. visiting a clothing store in washington, d.c. tuesday, the president suggesting it is nearly impossible to predict whether and when vladimir putin might invade ukraine. there is been no change in the posture of the russian forces. this is all putin. i don t think even his people know for certain what he s going to do. reporter: this as the biden administration has some 8,500 u.s. troops on heightened alert for deployment. the pentagon now saying that number could increase in the coming days. the president making this assurance. we have no intention of
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