Dear Aurelien and others!
The very pale sides to the tail may be bewildering, as orientalis - the ssp. occuring in East Asia, are shown in e.g. the Collins Guide - with darker gery sides to the tail.
From studies of many birds in South korea recently i can confirm, that the sides of the tail in orientalis here (as well as in East China and Japan) are paler that shown in the Collins guide. Often, they could be judges as off-white, but never the poor white of meena and Turtle Dove. Clearly, the differences between orientalis and meena are smaller than generally believed.