JAAMOI, in smaller airfields in Russia and the CIS they clear you to descend on the slope to, say, 2,000', then to call. You are then handed over to TWR who give you futher descent.
This profile is, of course, impossible, so the only solution is to call 2000' at, say 3000', continue on the slope as you change freq, and then continue the descent regardless of what TWR says, but hoping that they will have cleared you below 2000' by the time you get there.
This probably explains why some CIS pilots seem to have the habit of calling level when they are still in the descent.
W