As in, if you make X per year; and you have >3X in savings from Y>3 years of spending (a lot) less than you make and stuffing the difference under a mattress, then all your savings in excess of 3X get confiscated.
In other words, similar to people on welfare in America, public servants in Russia are now not allowed to retain assets in excess of a certain limit proportional to their income—even when that income all came directly from their (government) job.
This is analogous to a progressive wealth tax, but not the same; as a wealth tax still allows disproportionate wealth growth for the highest-income earners; while the goal of this measure is to leave you with at most exactly three years of however-much you’re currently making, and nothing more, no matter what your assets looked like before that.
The key “feature” to observe about this approach, IMHO, is that under this system people who are close to the savings cap already, are incentivized to spend every ruble they make, as any extra “left over” come audit time will be taken away. (It’s a bit like the game-theoretic consequences of yearly-limit insurance coverage, actually!)