Sadie Tamirow is Minna Lehtonen.
Morena Dalidow is Tiina Lehtonen.
They are both Finnish.
Here's a page from a Finnish magazine Erotiikan Maailma:
They were originally "page 3" girls in a Finnish news magazine Iltalehti. That EM page has a picture of the original Iltalehti article (seen better in the second picture).
The girl on the top of the solo pictures and on the left of the picture with both of them is Tiina, as seen in the text (sorry for the bad quality).
The other is Minna.
They went on to be models in porn photos and act in porn films. Glasnost with Love, which later got re-edited into Kristina Bellanova 5, stars both of them.
I'm not completely sure though if they both are in that bigger picture where they almost kiss. There are more pictures in later pages, but while Minna is the other girl for sure, I'm not certain the other girl is Tiina. They are trying to imply in the article that it really is them both but the wig(?) makes it hard to really ID her.
Anyway, Glasnost with Love has a short scene with Morena/Tiina speaking fluent Finnish.