The Russian Butte is a Middle Fork Classic.Lots of awesome views of this majestic valley from the summit.
I used a different approach as opposed to the one you describe. Cross Middle Fork and gain the trail along Pratt River. Head up trail for maybe a couple of miles and then head up steep slopes on the East side of the Butte. Make sure you are on South side of the summit and gain crest and then work your way up to the summit.
I did this as a winter climb, hence I not too sure about rock quality.
Ascent can easily be done without any need for rope.
Do It.