lysytsia's look said it all.told us, their lives depend on the hospital supplies, such basic supplies as blood, for example. you can't delay an operation for an oncology patient for a week or two. you can't stop their treatment because timing is crucial. if you delay chemotherapy for two weeks, then you've lost some percentage of their chance to survive. >> reporter: the plight of desperate children touched the first lady of ukraine, olena zelenska. we met in kyiv in september. elegant but weary, she seemed to bear the burden of 44 million ukrainians. kids with cancer were among the first to find her empathy. how did you work with other countries to evacuate these cancer patients? >> translator: on my level, i can speak with the first ladies. for this convoy to work, they needed to set up the system in their countries, making sure that physicians and hospitals in their country would accept the children for treatment. jill biden responded for the united states. brigitte macron for france. agata kornhauser-duda for