  A quantum spin-liquid might be realized in $\alpha$-RuCl$_{3}$, a
honeycomb-lattice magnetic material with substantial spin-orbit coupling.
Moreover, $\alpha$-RuCl$_{3}$ is a Mott insulator, which implies the
possibility that novel exotic phases occur upon doping. Here, we study the
electronic structure of this material when intercalated with potassium by
photoemission spectroscopy, electron energy loss spectroscopy, and density
functional theory calculations. We obtain a stable stoichiometry at
K$_{0.5}$RuCl$_3$. This gives rise to a peculiar charge disproportionation into
formally Ru$^{2+}$ (4$d^6$) and Ru$^{3+}$ (4$d^5$). Every Ru 4$d^5$ site with
one hole in the $t_{2g}$ shell is surrounded by nearest neighbors of 4$d^6$
character, where the $t_{2g}$ level is full and magnetically inert. Thus, each
type of Ru sites forms a triangular lattice and nearest-neighbor interactions
of the original honeycomb are blocked.
