  The present studies show that long-range magnetic order takes place in
RuBr$_3$ at $\approx$ 34 K. The observations of clear oscillations in the muon
time spectra demonstrate the presence of well-defined internal fields at the
muon sites. The magnetic ordering appears to be very robust and static
suggesting a more conventional nature of magnetic ordering in the RuBr$_3$
system at zero field. Present investigations prove that in RuBr$_3$ the Kitaev
interactions are likely to be weakened at zero field in comparison to the
$\alpha$-RuCl$_3$ system. This proves that it is possible to tune the Kitaev
interactions by replacing Cl with heavier halogen elements such as Br.
