11 years ago, Russia increased their military budget threefold. Between 2011 and 2020 484 Billion € were used to modernize the army. They still have thousands of T-72 and there is no point in not using them. However, these look like T-90:Some Russian posters here push a narrative about Chinese tanks being sent westward for Russian army. I don't know whether it is true or just a piece of Russian propaganda.
Russian army is mostly old junk. No one says Russia doesn't have equipment and hardware. They have plenty of that. But maybe they need more relatively modern warfare, who knows.