To the extent that Passio-Corum is a member of the USSO, citizens of the Pallisican nation are eligible to receive USSO passports which allow them to travel freely across all of the alliance's member nations.
The Pallisican Foreign Office is responsible for the foreign affairs of Passio-Corum.
Despite its expansive trade networks, which extend across much of Micras' eastern hemisphere, and despite its involvement in foreign conflicts, the Greater Pallisican Trade Association is officially isolationist in its foreign policy. In general, the government of Passio-Corum only engages with foreign governments in matters relating to trade, and military interests. That said, the nation for a long time enjoyed very few, loosely enforced treaties with a handful of nations. This changed with the establishment of the USSO. In terms of enemies, Passio-Corum has none, although Jingdao was regarded as a national rival until in an ironic twist of fate it became a strong ally and trade partner.
Formal relations between Passio-Corum and Craitland were adopted in early 2017. Positive relations are maintained between the two nations despite Gerenia's complete withdrawal from the USSO.
Similar to the Kingdom of Caputia, Constancia has - on the basis of obsessive and unfounded anti-Bassarid hysteria - adoptedpolicies which stand in strict, direct violation of the treaties that have long defined the peaceful and relatively friendly relationship between itself and Passio-Corum. Passio-Corum therefore regards Constancia as a de-stabilizing force in southern Eura, where the Pallisican nation has long struggled successfully to establish and maintain peace and prosperity.
Despite the existence of treaties between the two nations, Caputia - driven by a peculiar level of anti-Bassarid hysteria - regards itself as an adversary of Passio-Corum. Caputia, to this end, has severed all ties between itself and Passio-Corum, and has unsuccessfully adopted measures aimed at violently purging itself of Bassarid influence. It is the position of Passio-Corum that Caputia's unreasonable and obsessive aggression and hostility are impediments to long-term global peace.
During the War of Lost Brothers Passio-Corum laid siege to the island of Talenore, which is now claimed by Iteru. This fact is the source of tension between the two nations.
Passio-Corum operates a puppet government in the Natopian territory of Normark. The existence of this puppet state is a source of animosity between the two nations.