The peace of Westfalia established state sovereignity. That is a cornerstone of international relations, and when it is breached it is usually condemned.
> peace of Westfalia established state sovereignity. That is a cornerstone of international relations
The Westphalian treaties gave France, Sweden and later Russia the explicit right to intercede (i.e. invade) to guarantee the Imperial constitution [1]. (Westphalia was concerned with the Holy Roman Empire.)