The world war is actually pretty simple to explain.
The forum moderation and the game's admin are biased towards favoring the NPO (an alliance). The NPO are a bunch of elitist assholes who go around spamming threads with "HAIL EMPEROR IVAN!" and general dickery, because they can get away with it.
Just recently someone who was kicked out of another alliance called the LUE posted some goatse and other disgusting, but somewhat humorous in light of the NPO's attitude, crap on the forums. The NPO started throwing nukes at the LUE and GATO, the oldest alliance in cybernations, was bound by their Mututal Defense Pact to help the LUE. As well as a good set of morals.
The NPO has a long history of just starting wars over random crap and then at the end demanding incredible amounts of money and tech (very expensive) in reparations. Combined with their asshattery most of cybernations has gone to war with them.
SO far its; GATO-LUE-GGA-GPA-ODN-UDU and more against NPO-NpO-IGC. The IGC just dropped out though afaik, and the NpO is a puppet alliance.
It gets better though, a cabal called the Coven of the Lost has been sneaking around and basically recording history.
AAAaaaand thats basically the story of the 3rd cyberworld war.
[edit]
Forgot to mention, since the war started the NPO has been accusing everyone not shouting "HAIL IVAN" of supporting rape in real life.