I have not thought about the modalities that a national list system would involve, but there could be a national list, redistributed regionally. That means that, in the case we are dealing with, there would be a provincial redistribution that would observe the principle of proportionate representation.
What I am saying is that the United States has a political system that is completely different from ours, but it is still a federation. The same goes for Russia. The fact of being a federation does not pose an obstacle to the reform of the method of voting. The obstacles are those that I spoke about during my presentation. They are limits or parameters rather than obstacles to the reform of the method of voting.