It's tannu tuva, i'm not 100% sure on the history but i believe that in ww2 before being annexed by the soviets it was a country only recognized my the soviets and mongolia. It was surprisingly easy, i'll post the steps if anyone's interested Tannu tuva is a historical name for the tuva republic, a russian region in siberia which used to be an independent state in xx century then joined russia
Tannu Thakor vlogz - YouTube
In hoi4 gaming circles, it is the stereotypical tiny incapable state that is uninteresting to play because it can't do anything, and people who manage to do something big as this tiny country are considered memetically good at the game.
If you wanna know how to play tannu tuva properly, search ‘bittersteel siberian tiger’ on youtube.
I don't have a phd in soviet influence in mongolia during the early 20th century, but from what i know, the mongolian & tannu tuvan governments were instated by the soviets, were protected by the soviets and the soviets had vast influence over the politics of the nations (for example, the soviets removed and killed the mongolian prime minister for slapping stalin in the face). Tannu tuva, tannu tuva is a small country in siberia north of mongolia and surrounded by the soviet union… Formed siberia and then turkestan as tannu tuva, got the siberian tiger achivement