Russian Solitaire is a harder variety of Yukon Solitaire. It is harder as suits must match when cards are dragged and dropped on the Tableau - or picked up and placed depending on whether you prefer to play with a real deck of cards.
It appears that there is another game also called Russian Patience requiring two decks of cards.
This is described in Games of Patience by Mary Withmore Jone's in the 1920's, and which I think might nowadays be known as Alaska?
I haven't implemented either of these games of Solitaire as yet. On doing so, I will revisit this page and attempt to clarify matters to my own satisfaction.
The world is already complex enough without Solitaire naming confusion making things harder.