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The answer to it is already on the website:

From 29.10.2012:

Question: Can Grandma bring a child 2 years to treatment in China? What documents are needed?

Answer: In this case, for a child under 18 years of age when registering an individual Chinese visa to a standard package of documents, a copy of the child's birth certificate, a copy of the notarized travel authorization from both parents, photocopies of the internal passports of both parents. If the grandmother is a pensioner, then she needs to transfer a copy of the pension certificate and a sponsorship letter from one of the parents, as well as a certificate from the sponsor's place of work.

From 26.03.2013:

Question: Permission to export a child with his mother from his father for how many days you can get?

Answer: In accordance with the Russian legislation for the departure of a minor child outside the Russian Federation accompanied by one of the parents, the consent of the second is not required . However, the consular services of the embassies of many countries (including the PRC ) for the registration of entry visas require a notarized consent for the departure of a minor from one or both parents. . Due to the ambiguous interpretation of the term "term" and the numerous disputes in this regard, what period can be indicated in the column "time of departure" in the hut problems and questions raised by consular officers and border guards are recommended to register consent for the child's departure for a specific trip, indicating the exact dates and certain visiting states. .

From 26.04.2013:

Question : It is urgent to take out a child of 4 years old for treatment in China. Do I need permission from my father? I have different surnames with my child, but I do not know where to find my father. Time is running out. How to be?

Answer: In accordance with Russian law (FZ of August 15, 1996 .N 114-FZ "On the procedure for leaving the Russian Federation and entry into the Russian Federation") for the departure of a minor child outside the Russian Federation, accompanied by one of the parents, the consent of the second is not required..However, from July 22, 2005 .by order of the Border Guard Service of the Federal Security Service of Russia from 11 .07 .2005 г .When crossing the border of the Russian Federation by children under the age of 18 (regardless of whether they are entered into the passport of the parents or not) accompanied by both or one of the parents (guardians, adoptive parents, trustees), you should have a document certifying the relationship (birth certificate, certificate of birth guardianship, marriage certificate, divorce, paternity certificate and t .д .) .In your case, of course, it is recommended nevertheless to issue a notarized consent to leave the father .