full-scale invasion with the amount of troops that russia had amassed at the border. there has clearly been a dramatic shift in tone and in the calculations that ukraine's leaders are making. and so the question now becomes, is there anything that can be done to avert this catastrophe and to try to turn this situation around? w wolf? >> it really looks ominous. clarissa, you're there in kharkiv. the u.s. had warned a particular concern for that city, that city where you are. what more can you tell us about what you're actually seeing right now on the ground? >> so, on the ground, wolf, you're seeing, as you can probably see behind me, it's incredibly quiet. it's the middle of the night. but this is a city of 1.4 million people, wolf. and it is pretty extraordinary to be in a situation where we could be potentially -- or certainly seems they're closer to -- an actual imminent invasion of some sort or incursion of some sort, and we