Flag of the Karelian SSR

Another flag (this one for an entirely different timeline). In this timeline, the Karelian Uprising of 1921 is successful, and the Republic of Karelia is born. However, it is soon torn between (Socialist) Russians and (White) Karelians. The Russians, far superior to the Karelians in armed power, establish the Karelian Socialist Soviet Republic.

Alternatively (and the purpose I created the flag in the original place), Karelia is a republic of the USSR.

Before you ask, yes, the white stripe is supposed to be smaller than the green and blue