secretary jen psaki hinted today at the explosive nature of the situation. >> we believe we're now at a stage where russia could at any point launch an attack on ukraine. i'd say that's more stark than we have been. >> secretary of state antony blinken is en route right now to ukraine as the u.s. weighs its next move to counter russia's aggression. cnn's matthew chance is in kiev, ahead of blinken's arrival. >> reporter: this is the actual video, complete with soundtrack, put out by the ukrainian military. being fired to the beat, javelin anti-tank missiles supplied by the u.s. as part of its growing military support. it's these kinds of weapons ukraine hopes will help stop another russian invasion. and it wants more. cue a flurry of diplomatic fist