To minimize the risk that she will change her mind and keep the child, you must show your commitment by being there to assist her in childbirth classes and labor. She and everyone involved must see and accept throughout the process that this is YOUR child. The mother declares you to be the father on the birth certificate, and the child is given your last name. Keep in mind that she will still have a lot of power, unless she expressly relinquishes custody. Check out the adoption resource pages on the Internet.
Single men can legally adopt too.
Contact adoption agencies directly. Russia presently has many children waiting for homes. It is nice to know that there are other men who, like myself, have intentionally become a single parent. LOTS of women have done it, and I'm sure some other men have, and others would like to. After all the disagreement I went through with my wife over the raising of my first two children, I resolved to do it again the way I wanted.