This command adds the specified amount of trust (from your current country) to the specified country tag.
trust [country tag] [amount]
|The country tag to add trust to (trust is added from the country you are currently playing as).
|The amount of trust to add. Specify a negative number to remove.
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trust FRA 10
The above command would make your current country's trust in France (FRA) go up by 10.
trust FRA -10
The above command would make your current country's trust in France (FRA) go down by 10 (as negative 10 was specified).