strong economic measures. reporter: he told reporters the call covered a range of issues, including america s support for ukraine s sovereignty and territorial integrity, a readiness to respond with strong economic measures, and the willingness to provide additional defensive material to ukraine. . and that was why it was extremely important for our president and for other leaders in europe to be very clear about the extreme consequences that will result for russia if they move against ukraine again. reporter: but president biden offered another option for russia. de-escalation and diplomacy. the united states and our european allies would engage in larger strangic issues. reporter: russia entered with its own demands, seeking guarantees on ukraine and nato. the kremlin said putin stressed that the responsibility should not be shifted onto the shoulders of russia, since it is