Ruthenia is a translation for Rus, and describes much of the region that the node covers. Ruthenia, Lithuania, Rus, Kyiv, even Vilnius, all could do.
Smaliensk was able to avoid the catastrophic decline that Kyiv and other cities sacked by the Mongols suffered, but while it was a trade centre, it wasn't as important as cities such as Vilnius or Lviv. Homiel, Berescie, and Miensk are still not fitting, and to be fair, they considered themselves at the end of the era (along with in Smaliensk), Litvins, or the Rus of Lithuania.
Ruthenia is still the best option, as the other Latin forms for Rus, such as Rusia, Russia, etc. have been claimed by the other neighbour. Before, Ruthenia, Russia, Rusia, etc, were exclusive to Rus, i.e. Central and Western Ukraine and Belarus. Lithuania is still fitting due to Vilnius' central role in reuniting Rus and using Rusian rather than its own native Lithuanian in ruling the country, which is also why I suspect the Lithuanian capital is part of the node, as the Lithuanian Grand Prince was also Grand Prince of Rus-Kyiv.