Ха-ха.
In the USA, to take a child across state lines, you generally need agreement from both parents, even if you are only one of them, unless you have sole legal custody; in such cases, you should carry a copy of your custody court order as proof when traveling with the child.
To take a child from Russia to the USA, you generally need agreement from both parents, unless one parent has sole legal custody, as taking a child out of a country without the other parent’s consent could be considered kidnapping under international law; you should always consult with a lawyer specializing in international family law to ensure you follow proper legal procedures.