It's worth pointing out that there's a distinction to be made between having modern military kit and being able to effectively use it. This is a problem that most notably plagues the Arab militaries, in that they have the funds to buy the good stuff, but they are unwilling to invest in the training (or the operational independence) to effectively use it [1].

I'm not sure how modern Russia and China fare in this regard, compared to each other or to Western powers. Both countries have definitely showed signs in the past decade or so of trying to push through military reforms and adding more junior officers compared to senior officers.

[1] Classic case study: first Gulf War, where the casualty ratio was a lopsided 100:1, despite the Iraqi military having rough numerical parity and access to modern kit.