  A non zero, surprisingly large value of the third mixing angle $\theta_{13}$
has been measured in reactor neutrino experiments. Currently the most precise
measurement of $\sin^2 2\theta_{13}$ has been performed by the Daya Bay
experiment $\sin^22\theta_{13}=0.089\pm 0.010({\rm stat.})\pm0.005({\rm
syst.})$ (7.7 $\sigma$ significance of $\sin^22\theta_{13} > 0$),the RENO
experiment has measured the value $\sin^2 2\theta_{13} = 0.113 \pm 0.013(\rm
stat.) \pm 0.019(\rm syst.)$ (4.9 $\sigma$ significance) and the Double Chooz
experiment $\sin^2 2\theta_{13} = 0.109 \pm 0.030(\rm stat.) \pm 0.025(\rm
syst.)$ (2.9 $\sigma$ significance). These results are extremely important for
future searches of violation of combined CP parity in lepton sector of the
Standard model.
