The Deydono Doctrine is a foreign policy doctrine and ideological statement that was introduced by Sekowo in April 2456. Its basic idea is that Dovani is to be ruled only by Dovani states, in opposition to Western Imperialism, and that any attempt by non-Dovani nations to establish colonies on the continent would be viewed as an act of aggression. The doctrine also supported decolonization efforts in Dovani, and called for continental cooperation, for instance in granting aid to newly independent states. The Deydono Doctrine was one of the earliest expressions of Pan-Dovanism, and its most important manifestation was the Dovani for the Dovanians treaty. In time, the expression "Dovani for the Dovanians" has become synonymous with the Deydono Doctrine.
The first to state the doctrine was Lucumon Deydono, the foreign affairs minister of the Federated Cities of Pan-Sekowo, in a speech in front of the Apellas. During that time Sekowo was emerging as a regional power after it had liberated itself from under Aretism, and it had just begun to establish its own colonial possessions. This enterprise was rather timid at first, due to the fact that Western empires laid claims to large parts of Dovani. This prompted Sekowo to seek support among the other nations on the continent, in hope of avoiding competing on its own against the West.
The speech of Deydono soon materialized in the creation of the Dovani for the Dovanians treaty in April 2456. The treaty received a fairly enthusiastic reception from the other Dovani nations, being ratified by most of them within the first decade. The Dovani for the Dovanians was mostly favourable to Sekowo, who could now pursue a colonial policy with limited risk of foreign conflict. The Deydono Doctrine was the main justification for the extent of Sekowan expansion and for the colonisation of territory already claimed by non-Dovani states.
The Deydono Doctrine was most notably invoked during the Medina War with Hutori and Trigunia during the 2560s until the 2580s. When Hutori decided to explore and colonise parts of Dovani already claimed by Sekowo, war broke out, and lasted for over a decade, especially due to Trigunian intervention.
The Doctrine was a major element behind the successor treaty to the Dovani for the Dovanians, the Dovani Territorial Defence Organization. The new treaty however, while being still in force, was ultimately much less successful. Its provisions were less stringent than those of the original treaty (while the Dovani for the Dovanians prohibited any foreign colony on the continent, the new treaty allowed them after the explicit permission of 3/4 of the signatory nations), and now large parts of Dovani are ruled by Western states (Luthori, Zardugal, Rutania, Vanuku).