Your Excellency is mistaken. Holy State of Rotria and Kingdom of Elderland are in a union. But this union is not limiting either country's foreign policy. The passage from the pact states:

Cytat:Countries included in he union, declare that hey will be trying to accomplish mutual stand in the field of foreign policy and give the same statement abroad in the key concepts for the national interest of the union countries.

By this we can clearly see that both HS Rotria and Elderland have separate foreign policies, but will try to have the same stand. An this is not illegal.