>> it is difficult because we've gone through such a long way of treatment. we have been getting treatment for a year now. and when we had such a little step left to make to the finishing line, to the happy end. this dream abruptly stops. >> reporter: tomorrow she'll take alexei by bus to a hospital in poland. she has left her other children behind in kyiv. >> translator: my youngest is 3 and my oldest is 16. they have to stay there, and my heart is breaking. i'm i am grateful we can go and continue the treatment and help my child who really needs it right now. but on the other side, i am so worried as i'm leaving my two other kids behind. >> reporter: that is an impossible decision to have to make. >> yes. but we have made it so far in the treatment. and have i strong belief that our treatment will be successful. >> reporter: in another room, we met bogdan. is this your truck? at 2, he survived a heart