Most international adoptees remain citizens of their country of birth unless they renounce that citizenship after they reach the age of 18. Adopted children come to the U.S. with a passport from their country of birth and eventually that passport expires. In the case of Russian adoptees, they are required to travel to Russia with a valid Russian passport unless they have formally renounced their Russian citizenship. Renewing an expired Russian passport can be a daunting task, particularly if you no longer are fluent in Russian.
For more information, please contact David Schunk.