has said they will unleash sanctions on president putin himself and on his foreign minister serge delay lavrovne little to stop putin. the ukrainian president defiant, standing in the streets of the ukrainian capital kyiv, promising to fight for their city, for their country. a country under violent attack by the military. the u.s. is concerned that the capital city of kyiv will fall within days. in the last hour or so, sirens could be heard across kyiv, warning ukrainians of possible air strikes. it's midnight there now and the mayor is warning of a difficult night ahead. earlier, tens of thousands of people including this chaotic crowd at a kyiv train station were trying to escape the fighting and violence, or to reunite with their families in other parts of the country