Laws apply to whatever they say they apply to. Limiting their scope to actions in the country, or at least giving precedence to similar foreign laws, is at least as much about the practicalities of enforcement as a matter of principle.

For example, Finland claims jurisdiction over crimes where the action itself or its relevant consequences happen in Finland or the victim is a Finnish citizen, permanent resident, or legal entity. Then there are plenty of rules and exceptions detailing what those principles mean in practice.