Re: ROMULUS
Aha! I can now reverify what i said. I skimmed through the history a little fast before, but the corrections im now making only make the supernova less unlikely.
The asassination of a bulk of the Romulan Senate (and here comes the correction) occured in 2406 on ch'Rihan after the fall of the republic.
how is this explained?
What the hell are you
talking about? What are you reading? (And are you sure that they're using the Gregorian calender when they cite the year 2406?)
Anyway, understand that in
Star Trek, only the films and TV shows are canonical. That doesn't mean that novels or books or games or comics "didn't happen" -- but it does mean that future films or TV shows don't have to stay consistent with the novels, et al, if they don't want to.
An intriguing possibility put forth in one of the books, I think by Keith Candido, is that the Romulans split into two Empires. One headed by Tal'Aura who formed an alliance with the Gorn, Breen, and the Tholians. The other headed by Don'atra and Cmdr Toreth which had a chance(just a chance mind you) of having good relations with the Federation.
More specifically, the novel
Titan: Taking Wing by Michael A. Martin and Andy Mangels established that the post-Shinzon, post-Senate Romulan Star Empire had several different factions that were vying for power in Ki Baratan (the capital), with Tal'Aura, the Senator who set the thalaron weapon and murdered the Senate on Shinzon's behalf, setting herself up as Praetor, with Tomalak as her Proconsul. Tal'Aura only has the loyalty of about half of the Imperial Fleet, however -- the other half is answering to Donatra, the Imperial Fleet Commander who turned on Shinzon when she realized he was planning to commit genocide against Earth and helped the
Enterprise-E defeat him.
The novel
Articles of the Federation by Keith R.A. DeCandido established that between in-fighting between the two half of the Romulan fleet, conquered vassal worlds declaring independence, and civil strife between Romulans and Remans on Romulus and throughout the Empire, the Romulan Star Empire seems on the brink of civil war. In December of 2380, about a year after NEM, Donatra and has her fleet gain control of several major agricultural worlds and declare independence from the Romulan Star Empire, forming the Imperial Romulan State and declaring herself its Empress. Empress Donatra's territory encompasses about half of the Star Empire and half of its military.
In the
Destiny miniseries, both the Romulan Star Empire and Imperial Romulan State, amongst all of the nations of local space, ally with the Federation against the Borg invasion. Both promptly get their asses handed to them since the Borg are actually out to invade and aren't fooling around with only one ship at a time. Like the rest of the Alpha and Beta Quadrants, they're only saved at the last minute by the miraculous ending to
Destiny that you really ought to read, because it's actually good. During the invasion, a ship from the Imperial Romulan State sacrificed itself to save a Federation world, while the Romulan Star Empire never sent any ships into Federation space -- so the Federation is now much more inclined to be nice to Donatra's government than Tal'Aura's.
In the novel
A Singular Destiny, also by DeCandido, the Star Empire joins the Typhon Pact, an alliance of the Romulan Star Empire, Gorn Hegemony, Tholian Assembly, Tzenkethi Coalition, Breen Confederacy, and Holy Order of the Kinshaya formed after all of those nations realized the benefits of peaceful cooperation and unity over factionalism and war after the invasion... but still didn't want to join the Federation. In response, the Federation and Klingon Empire announced that they're calling a summit to see about expanding the Khitomer Accords to encompass the Cardassian Union, Talarian Republic, Ferengi Alliance, and Imperial Romulan State.
An upcoming miniseries called
The Typhon Pact will be about the new relationships between Typhon Pact and Khitomer alliance members.
The game
Star Trek Online has used the Imperial Romulan State and Tal'Aura/Donatra rivalry as part of its background, but their version of events is very different. There's no Typhon Pact, and the I.R.S. rejoins the R.S.E. after only a few years.