Most of us have always wanted to have a few extra-marital affairs every now and then.
You need a time out from your difficult, sexless or loveless marriage.
Perhaps I can give you a few suggestions and a little insight into who you should be looking for and what they are looking for from you. That beautiful Russian woman that you think you love is as nervous about this thing as you are, probably more so, and she wants to be absolutely sure of what she's getting into because once she takes the step of inviting you to visit, there will be no turning back.
These comments are based on my own experience and conversations I have had with others in the same situation. Generally, a visit leads to marriage and she knows it. She knows more about life and how to survive hardship than you will ever have to know.
And guys, be realistic about what you are searching for and be honest about yourself.