  KM3NeT is a new generation neutrino telescope currently under construction at
two sites in the Mediterranean Sea. At the Capo Passero site, 100 km off-shore
Sicily, Italy, a volume of more than one cubic kilometre of water will be
instrumented with optical sensors. This instrument, called ARCA, is optimized
for observing cosmic sources of TeV and PeV neutrinos. The other site, 40 km
off-shore Toulon, France, will host a much denser array of optical sensors,
ORCA. With an energy threshold of a few GeV, ORCA will be capable to determine
the neutrino mass hierarchy through precision measurements of atmospheric
neutrino oscillations. In this contribution, we review the scientific goals of
KM3NeT and the status of its construction. We also discuss the scientific
potential of a neutrino beam from Protvino, Russia to ORCA. We show that such
an experiment would allow for a measurement of the CP-violating phase in the
neutrino mixing matrix. To achieve a sensitivity competitive with that of the
other planned long-baseline neutrino experiments such as DUNE and T2HK, an
upgrade of the Protvino accelerator complex will be necessary.
