In addition, Russia's regulatory body seems to be pushing the idea that Rostelecom and MegaFon should implement RAN sharing because it is unreasonable to have two LTE networks in Sochi. Perhaps this has more to do with ensuring that the Russian military has enough spectrum for its own network.
Yota, which has existing coverage in Sochi (among other cities) with its WiMAX network, is currently in disupute with the Russian regulator over whether or not it is allowed to deploy LTE. It is unclear if Yota is looking to deploy TD-LTE in its existing TDD spectrum it had intended to use to expand its WiMAX network to other cities or FD-LTE in separate FDD spectrum. It is possible that the real reason behind denying Yota the right to build an LTE network has to do with the Russian military's LTE goals as well.