Georgia, Aserbaijan. Then don’t forget the east, that is, the -stans and Mongolia. China and Japan are safe and who even wants NK.
The stans traditionally looked towards China for protection (also see Silk Road initiative) but they’re making moves to make themselves more palatable to the west. Mongolia is the odd one out they’re actually a proper democracy, and very much NATO-aligned though they (just like Japan) don’t qualify because geography. They’ll continue being a buffer state between Russia and China as long as they’re west-aligned neither will suspect them to be in bed with the other.