What was the difference between foreign policy and domestic policy?

Domestic policy is to control the internal life of the state. In addition to control, this can also include reforms and transformations aimed at changing or improving the existing state of affairs, creating new authorities or abolishing old ones.

Foreign policy presupposes the maintenance of diplomatic relations with neighboring and other countries, the conclusion of treaties (including economic ones). In addition, the diplomats also played the role of spies who reported on everything.