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The proposed Long Baseline Neutrino Observatory (LBNO) initially consists of$\sim 20$ kton liquid double phase TPC complemented by a magnetised ironcalorimeter, to be installed at the Pyh\"asalmi mine, at a distance of 2300 kmfrom CERN. The conventional neutrino beam is produced by 400 GeV protonsaccelerated at the SPS accelerator delivering 700 kW of power. The longbaseline provides a unique opportunity to study neutrino flavour oscillationsover their 1st and 2nd oscillation maxima exploring the $L/E$ behaviour, anddistinguishing effects arising from $\delta_{CP}$ and matter. In this paper weshow how this comprehensive physics case can be further enhanced andcomplemented if a neutrino beam produced at the Protvino IHEP acceleratorcomplex, at a distance of 1160 km, and with modest power of 450 kW is aimedtowards the same far detectors. We show that the coupling of two independentsub-MW conventional neutrino and antineutrino beams at different baselines fromCERN and Protvino will allow to measure CP violation in the leptonic sector ata confidence level of at least $3\sigma$ for 50\% of the true values of$\delta_{CP}$ with a 20 kton detector. With a far detector of 70 kton, thecombination allows a $3\sigma$ sensitivity for 75\% of the true values of$\delta_{CP}$ after 10 years of running. Running two independent neutrinobeams, each at a power below 1 MW, is more within today's state of the art thanthe long-term operation of a new single high-energy multi-MW facility, whichhas several technical challenges and will likely require a learning curve.

The LBNO long-baseline oscillation sensitivities with two conventional neutrino beams at different baselines