u.s. troops have been placed on heightened alert for possible deployment to eastern europe. pentagon spokesperson john kirby says despite calls for russian president vladimir putin to step back from ukraine, he's actually sending new troops to the border. >> they continue to add tactical groups to their western border, to the border with ukraine. and in belarus as well. they've shown no signs of de-escalating but they are adding more force capability. >> president biden held a conference call on the crisis and touted total unanimity. >> hi, nic. >> hi, christine. we've just heard from dmitry pes