Nation in Kremlin diatribe (5)
I believe the answer is:
india
'nation' is the definition.
(India is an example)
'in kremlin diatribe' is the wordplay.
'in' indicates the answer is hidden within the clue.
'INDIA' can be found hidden inside 'kremlin diatribe'.
(Other definitions for india that I've seen before include "Country in South Asia" , "Second-most populous country" , "vast country" , "Bollywood's country" , "land in the East" .)