Please define what "rights of communication/access" granted to her X-husband by the Amicable Agreement. What do these rights include? Specifically does he have the right to determine her son's place of residence ("Habitual Residence").
Father’s participation in child’s upbringing is regulated by the amicable agreement. X-husband has no right to demand return of his ex-wife and child to Russia. A right to choose a place of residence is a personal right of a citizen. The parent with whom the child actually lives is entitled to take decisions related to the child unless otherwise provided for in the agreement. The amicable agreement contains no restrictions of limitations of that kind.
When considering a case about a place of residence of a minor child, a court decides whether the child shall live with the mother or the father but it doesn’t determine child’s address after divorce of the parents. In this case the child follows the mother when she changes her place of residence and father’s consent is not required.