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.

Уважаемый, Виталий. Вот ссылка на которой все подробно описано http://www.russia.uz/russian/consul/state

EXCUSE ME,MAY I ASK 1 QUESTION. HOW CAN I FIND JOB IN ST.PETERSBURG RUSSIA OR IS IT HARD TO FIND JOB IN ST.PETERSBURG RUSSIA AND HOW MANY PRECENT I HAVE ABOUT FINDING JOB IN ST.PETERSBURG RUSSIA. THANK YOU SO MUCH FOR YOUR ATTENTION

Dear Sir/Madam, My name is Ashish Dua, basically from India from last 4 yrs i m working in west Africa countries. Can you please help me to know from where and how I can get work permit OR which documents i need to obtain a Work Permit for myself in Russia. thanks and regards Ashish Dua