Will the first priority be to the child?
Nobody has a priority. According to the force of Russian law, you must maintain your child until he/she will be 18 years old (article 81 Family Code of Russia) and your ex-spouse if she has become disabled during your marriage. The mother of your child also can be entitled to get alimony during her pregnancy and until the child will be 3 years old, providing you will marry her according to the law.