Let’s see, the T-72 is obsolete, the T-90 is underwhelming, the Armata is unobtanium. In small arms the AK-12 is an AK-74m with shiny shoes and after a brief respite the Mosin-Nagant is back in the game.
That about covers a lot of it.
Oops, forgot about the cheap Chinese tires on their heavy trucks.