and in the past 24 hours, volunteers and translators at one romanian border crossing helped nearly 3,000 refugees, many of them fleeing the russian bombardments of mariupol and the as summy region. greeted with hot food, tea, water, medical care and sweets for children. but they are traumatized. the aid group mercy corps warns that some ukrainian towns could run out of food in three or four days, saying, quote, the humanitarian system has entirely broken down. many of those trying to escape the violence are passing through lviv here in western ukraine. some of those families spoke with cnn s ben wedeman about the struggles and emotions that they re having to process. reporter: while the children play, parents ponder a fate uncertain as they wait outside lviv s train station.