This study focuses on the comparison of behavioral development of children with early deprivation experience from families of St. Petersburg, Russian Federation and USA. It represents the results of the research involving thirty-one 5-8 years old child with socio-emotional institutionalization experience from Russian families and 4 comparison groups of children with life experience in institutions with different deprivation levels from USA families. The group of Russian children was divided into 2 subgroups: children transferred to biological families or relatives and those transferred to non-biological families. The Child Behavior Check List by T. Achenbach (2001) was used to examine behavioral development of children. Data show that children from Russian families had signifi cantly more extreme externalizing and social problems then children with socioemotional deprivation and different levels of deprivation from US families. These results were influenced by great deal of children with extreme scores on these scales in Russian biological families. In comparison to severely deprived children from Romanian orphanages adopted to USA families Russian children had less attention and thought problems mostly because of scores of children from non-biological families. Russian children had much more extreme externalizing and social problems than non-deprived children from USA families. Refs 62. Tables 2.