This is a falsely attributed quote. There's zero record of Zhukov (or anyone, particularly none of the various people this quote has been attributed to) saying this. It's a lazy stereotype of the CCCP's strategy during WWII and absolutely incorrect.
They don’t need sophisticated weaponry or artillery. Just a slow push until the opponent is exhausted.
Losses are irrelevant: they can always be hidden or denied because you control media.