@OmSigDAVID,
If the adoptive mother thought she was in imminent danger from this child, she should have taken him to an emergency room for immediate psychiatric evaluation. If the child, after psychiatric evaluation, was deemed to be a threat, he could have been hospitalized for further observation and treatment. That would have removed the threat from her home.
Meanwhile, you don't put an allegedly dangerous, mentally disturbed child on a flight to Moscow all by himself--and arrange for a total stranger you met on the internet to meet the child's flight in Moscow. This indicates such bad judgment on the adoptive mother's part it calls into question her appraisal of reality and casts doubt on anything she might report about the child's behavior.
A passenger on the flight to Moscow, who sat with the boy for a while, said the child was anxious and active. He ran down the aisles, but did not disturb anyone. He was obedient and sat down when asked to do so. He sang some Spider Man songs and drew some pictures. Were his drawings of a frightening nature, revealing violence or aggressive fantasies? No, he drew a picture of a plane with waving happy passengers. That doesn't sound like a menacing, dangerous child, does it?