Contact the nearest Russian consulate for guidance.

Review the USCIS form instructions for guidance.

For RFE response, best to respond all at one time.

Best to complete as fully as possible.

The new passport number should be used.

Yes it is possible and there is no harm in submitting request.

I agree with my colleagues. Consult with an attorney for review of your case.

No not without a qualifying relative as children can not act in this regard.

You may file but it will take 12-16 years for visa to become available.

Best to consult with an attorney to review prior to interview.