For certain definitions of effective. Sure, Crimea was certainly a victory (but only because they had very high on-the-ground public support), and denying vital

For certain definitions of effective. Sure, Crimea was certainly a victory (but only because they had very high on-the-ground public support), and denying vital industrial regions to Ukraine could be construed as a victory, but OTOH having a lawless, war-torn region ruled by right wing wannabe Stalinists on its borders isn't exactly a win for Russia.