RusMap is the main, but not the only mod that recreates territories of Russia in ETS 2. Others are: Southern Region, VolgaMap, SibirMap 2.0 and KirovMap. All these mods are compatible with each other, and their authors coordinate the construction of new territories so that the result would be a common map of Russia. However, at the moment, only RusMap and the Southern Region have a road connection. The rest of the territories remain isolated, but work is underway. Most likely, a full road connection will be established with the release of official Heart or Russia. In this context, its eastern part is of interest, it was not presented in any of these mods: Kostroma, Nizhny Novgorod regions and Mordovia republic (capital – Saransk). These cities will be as close as possible to the territories of other mods, and it will be possible to build a connection through them.
There are other mods about Russia (for example, Eastern Express), but they are not compatible.