I’m thinking circular territories wouldn’t work too well with your current map. If there were more territories in Germany, Berlin could work, but then those territories are too small. London/Tokyo would take away much needed space for units. I think no territories for cities is best.
Also, Siberia definitely needs reworking; you shouldn’t be able to go from Manchuria to Moscow in 3 turns with an infantry. The Himalayas need to be bigger, for a blockade of sorts for protecting India when China is conquered or vice versa. Other than that, looks fantastic!