No, there is no any special low which can provide you with visa if you are not married with your fiance, even you have common children. You can come to Russia to marry and make permission for temporary residence without quotas for three years.

rodilas v russia imeyu british documenty. grazdanka russia ili net? mogu poluchit noviy passport?

You need to go to Russia and marry russian women, its the start of your russian nationality/.

AS a Bangladesh nationality and resident in Bangladesh can I obtain a Job in Russia from bangladesh?