Do we need a prenup agreement?

I'm getting married in six months to my foreign girlfriend. I was advised by a friend that one of the things I need to do before saying I do is to get a prenuptial agreement. Basically it's supposed to protect my assets and properties in case my relationship with my future wife goes down the drain. I don't know though if this is an acceptable practice when marrying Kiev ladies. I don't want to do it if it would be insulting on her end. I need advice on this. Please help me.