Hello, I have been talking with a lady friend from Russia for months now and she would like to come visit me in Minnesota and from there who knows of

Your friend would need to get a visitor visa. If she intends to visit she would have to establish that she has enough motivation to return to Russia after her visit is complete. This would include a letter from her employer, tax returns showing stable employment paystub's showing three or four months of past work history, and bank deposits showing payroll receipts into her bank account. Additionally if she owed property, she could provide the consulate with a deed and an appraisal report showing how much equity she has in the property. Upon entering the United States with the intention to visit, but later on she changes her mind and decides to get married then that would be permissible. But you have to tell the truth.