Full-scale russian invasion. the u.s. is also taking no chances in ukraine, relocating staff from the embassy in kyiv, to the western city of la viv. some ukrainians are also not taking a chance with this mother, putting her 6-year-old son on a train to stay with relatives in western ukraine, so she can join the fight against russia, if it comes to that. >> it was very hard. i was looking to his eyes yesterday, and he was saying, mom, i love you, mom, i love you. nothing is value, just freedom. and between death and freedom, we choose freedom. >> with me now to talk about this, nbc news chief ...