You are talking about goluboj (голубой) and sinij (синий). Interestingly, to me they are not completely different: goluboj has always been just like "light sinij", even though Russian has remained my only language for about 20 years.
In Hebrew they also have голубой-tcheleth, and синий-kahol; but the threshold is significantly closer to the lighter part, so there could be said to be no direct correlation between the words. It is so up there, I'd bet, they do actually think them different colors. Так вот.
