The Russians have always fought their wars like this.
When put to the test of combat though, it was revealed that corruption, incompetence, and lack of genuine reforms had subverted the effort and led to the humiliation of the Russian army in the 2023 invasion of Ukraine. Now Russia is reverting to her traditional, casualty heavy tactics. I do not believe that they will be successful, at least not at a cost that a Russia in demographic and industrial decline can afford.
Oliver Stone's documentary about Putin proved (to my eye at least) that he is an intelligent and determined autocrat corrupted by power and wealth and surrounded by yes men. Such a combination rarely ends well.