there has been a dramatic shift. this really feels now like a country that's holding its breath. just earlier today, the mayor of kharkiv put out an announcement on twitter telling people to stay calm, to stay unified, to keep going to work, saying that city services are still functioning. and yet when we arrived here late this evening, we found check points going into the city. we also saw on our drive from kyiv, a large convoy of ukrainian military vehicles. but most strikingly honestly is the shift in tone, wolf, from ukraine's leadership. you heard president zelenskyy there switching from ukrainian and russian and directly appealing to the russian people to try to help avert this catastrophe, saying there's nearly 200,000 troops on this border, and your leadership has given them approval to cross in to ukrainian territory, to cross