With the exception of prime single word domains like major cities and major keywords, there are still some Russian and plenty of Indian still available for registration.
As for Japanese and Chinese, there not many generic single word domains (prime or mediocre) available for registration, although they still can be found - there are a couple new registration reported by forumers at the Taiwan IDN forum on a daily basis.
For reasons i do not know, the number of Korean domain left is lesser than Chinese or Japanese.