united in its support for ukraine and in its determination to make vladimir putin pay a very heavy price. in a separate event mr. biden made his harshest criticism. >> war criminal? >> oh, i think he is a war criminal. >> the president's allegations have to be proven in court to have legal weight. it's the kind of thing chief prosecutor of the international criminal court is here -- is in ukraine to investigate his part of his exclusive interview with cnn's anderson cooper. >> we have reasonable grounds to believe crimes within the court are committed. >> you have reasonable grounds to believe crimes against humanity has been committed? >> absolutely. it is a crime to intentionally target civilians. it is a crime to intentionally target civilian objects. now of course there has to be