russian troops remain on the border. the u.s. embassy says the shipment includes ammunition for the front line defenders of ukraine. new military options are also being worked on by the pentagon should russia invade, which could include beefing up the u.s. presence in eastern europe, and sources are telling cnn the u.s. embassy in ukraine has requested authorization from the u.s. state department to evacuate all nonessential staff and their families. cnn's international diplomatic editor, nic robertson is in moscow. both sides say they are committed to diplomacy, where is this headed. >> the diplomatic is open, and secretary of state antony blinken and the answer that came out is the path is still ahead but the reality is at the same time russia continues to build up its military presence around ukraine, not just those hundred thousand troops that were close to the border on the eastern side of ukraine but to the north, close to the capital in