Does the Orthodox Church possess the fullness of faith?; i.e. is the catholic church of Russia. The answer has been negative
In the Balamand Statement, the Catholic Church has affirmed that the Orthodox Church has the fullness of faith, entirely sufficient to provide for the salvation of its adherents (and, for what it is worth, the Orthodox delegates affirmed the same of the Catholic Church.
In the Balamand Statement, the Catholic Church also asserted that it would avoid any and all actions that might be interpreted as proselytism, but that it also had a moral obligation to provide for the pastoral needs of its members in Orthodox countries (which would include Russia).
As St. Paul refused to plow in another man's field, so it would behoove the Catholic Church to live up to the spirit of the Balamand Statement, and not plow on Russian territory, but to work with and through the Orthodox Church to reach out to the unchurched.