  $Li_{2}RuO_{3}$ with a honeycomb structure undergoes a drastic transition
from a regular honeycomb lattice with the $C2/m$ space group to a valence bond
solid state of the $P2_{1}/m$ space group with an extremely strong dimerization
at 550 K. We synthesized $Li_{2}Ru_{1-x}Mn_{x}O_{3}$ with a full solid solution
and investigated doping effects on the valence bond solid state as a function
of Mn content. The valence bond solid state is found to be stable up to $x =
0.2$, based on our extensive experiments: structural studies, resistivity, and
magnetic susceptibility. On the other hand, the extended x-ray absorption fine
structure analyses show that the dimer local structure remains robust even
above $x = 0.2$ with a minimal effect on the dimer bond length. This indicates
that the locally-disordered dimer structure survives well into the Mn-rich
phase even though the thermodynamically stable average structure has the $C2/m$
space group. Our results prove that the dimer formation in $Li_{2}RuO_{3}$ is
predominantly a local phenomenon driven by the formation of orbitally-assisted
metal-metal bonds and that these dimers are relatively robust against
doping-induced disorder.
