This debug command initiates a forceful reevaluation of all region assignments for the AI of your current country. If a country tag is specified as an argument, this command will apply to the country with that tag.
ai_plan_regions [country tag]
|Optional. The country tag of the country you wish to apply this command to. If not specified, the country you are playing as will be affected.
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The above command would make the AI reevaluate all region assignments for your country.
As Delhi has a country tag of DLH, this command would do the same as the first example, but for Delhi instead.