QNH below TL in Russia
The changeover to QNH below the Transition Level is aligned with the Moscow TMA redesign.
This redesign has been going through evaluations and the final design has not yet been approved by the Ministry of Transport. The latest version of the proposal, 8.5, seems to have more promise than the previous versions.
Evaluations of the Moscow TMA includes modeling of the concept, traditionally performed by the State Aviation System Research Institute.
This is a work in progress, and everyone is striving to get it correct with the first deployment.