It looks agouti to me. The photos are a bit small though...
Minks are more flat coated in color - chocolate milk/purple hued. Agouti is two toned. If you brush their hair backwards, they should have a black coloration under it (the banding Sorria is talking about). Minks don't have that.
And I can't say with any certainty about Russian Blue Agoutis. I am not very knowledgeable in agouti stuff. My colony is all black non-agouti based. We need Jerry! He should know this.
Two of my mink babies:
http://img.photobucket.com/albums/v9...s/DSC_0845.jpg
http://img.photobucket.com/albums/v9...s/DSC_0843.jpg