From an Orthodox perspective there is no justification for war; even a war of defense is a lesser evil but is still an evil. The Orthodox Church, by faith and practice, believes that peace is normal and just. Therefore, war would be not only evil but it would be non-normative. We are to seek peace in each and every situation. The Greek Fathers wrote about peace in all situations and as such there would be no Orthodox Just War Theory as exists in Western Theological thought.
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The Beautiful Path 