Tetiana Bezruk, a researcher of far right movements at the University of Kyiv Mohyla Academy, offers a brief analysis of the Right Sector movement here (in Russian and in English).
In her view the movement grew not because of its ideology but because of its actions in the self-defense of the Maidan. The appeal of that message remains limited, and their most recent actions — notably March 28’s attempted “storming” of the Parliament — have marginalized them further.