Physics potential of the combined sensitivity of T2K-II, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>NO</mml:mi><mml:mi>ν</mml:mi><mml:mi mathvariant="normal">A</mml:mi></mml:math> extension, and JUNO

Leptonic CP violation search, neutrino mass hierarchy determination, and the precision measurements of oscillation parameters for a unitary test of the leptonic mixing matrix are among the major targets of the ongoing and future neutrino oscillation experiments. The work explores the physics reach for these targets by around 2027, when the third generation of the neutrino experiments starts operation, with a combined sensitivity of three experiments: T2K-II, $\mathrm{NO}\ensuremath{\nu}\mathrm{A}$ extension, and JUNO. It is shown that a joint analysis of these three experiments can conclusively determine the neutrino mass hierarchy. Also, at certain values of true ${\ensuremath{\delta}}_{CP}$, it provides closely around a $5\ensuremath{\sigma}$ confidence level (C.L.) to exclude $CP$-conserving values and more than a 50% fractional region of true ${\ensuremath{\delta}}_{CP}$ values can be explored with a statistic significance of at least a $3\ensuremath{\sigma}$ C.L. Besides, the joint analysis can provide unprecedented precision measurements of the atmospheric neutrino oscillation parameters and a great offer to solve the ${\ensuremath{\theta}}_{23}$ octant degeneracy in the case of nonmaximal mixing.