[@Sep] Basically, we had some first encounters when the Gateways reopened and there was some friction between the Zetans, which are heavily augmented, and the ECU and the Undefeated, which don't consider them human anymore because of that. 
Then we made a timeskip - 6 months later, there is a new neutral station in the Sol system, where all nations can have their embassies and representatives. The Zetans were kicked out of the ECU space station, and while leaving, they took one of the ECU scientists with them, which has led to an open war. Currently, the Zetan navy has been destroyed and the ECU and Undefeated are preparing to launch a ground invasion on their homeworld. There are some diplomatic actions by other nations trying to stop the war.

I think that pretty much sums up the important parts. Feel free to join the Discord server, some people here apparently don't need to sleep at all, so there is always someone online to answer any questions.