As for United Russia, i am not the most knowledgeable on this subject, but from what i know it's basically a big tent party with no real unifying idea apart from being a platform for the current political establishment which is all about stability and status quo. They have largely managed to absorb virtually the entire center of the political ideological spectrum leaving only the communists, the western funded liberals, and the few truly far right Nazi types that exist in Russia (and this last group frequently enters into alliances of convenience with the astroturfed liberal opposition; the poster child for this type of collaboration is of course Navalny) still remaining outside of it.