Bhutan (B), China (mainland) (B), Estonia (B), Finland (B), Hong Kong (China), India (B), Japan (B), Kazakhstan (B), Laos, Mongolia (B), Myanmar, Nepal (B), North Korea (B), Pakistan (B), Russia (Asian) (B), Russia (Central Asian) (B), Russia (European) (B), South Korea, Taiwan (China), Thailand (B), USA, Vietnam.
Vagrant to Bulgaria, Denmark, France, Germany, Israel, Lebanon, Malaysia, Slovenia, Sweden, United Kingdom.
Unknown to Afghanistan.
Population
Estimated population is unknown (2010).
Red-flanked Bluetail (Tarsiger cyanurus) [XC464282]
by Frank Lambert from Ang Ka Summit Trail, Doi Inthanon National Park, Thailand (call)
Red-flanked Bluetail (Tarsiger cyanurus) [XC843238]
by Bram Piot from \u68a6\u6e05\u56ed\uff0cJingan\uff0cShanghai, Shang Hai Shi, China (call)
Subspecies
Subspecies rufilatus rather distinctive in both plumage and voice, possibly better treated as a separate species. Proposed subspecies pallidior (north-western Himalayas) synonymized with rufilatus.
The following 2 subspecies are recognised:
cyanurus (Pallas, 1773) - Finland and north-western Russia, and from Ural Mts east to Kamchatka, south to northern Mongolia, Japan and north-eastern China. Non-breeding southern and south-eastern Asia.
rufilatus (Hodgson, 1845) - North-western, central and eastern Himalayas east to central and southern China, probably also northern Myanmar. Non-breeding also Indochina. Considered by some authors to be a distinct species, Himalayan Bush-Robin (Tarsiger rufilatus).
BirdLife International Species Factsheet