Well, humanity is most likely screwed. Tomsk Union will likely stay independent under protection of Bjering, so no help from there.
The Tomsk Union has an understandable dislike for the USSR, which abandoned them to the D'Bringi and the Rehorish, but, like most of the colony worlds, they have a deep love for the Earth. For all that they left to go to other worlds, Earth is still thought of as 'home' by many of them. If the USSR had arrived on the scene and said, "we saved you, now you are rejoining us", it would be problematic for them. They might even try to fight to stay independent, especially if the Bjering decided to help. Under the current circumstances, who knows?
There are most likely some surviving shipyards in Sol still, but I have no idea how Starfire deals with productivity on planet that has high amount of radiation and dust in atmosphere. Is it possible to tow the shipyards from Sol to Sigma Draconis?
There are also Tarek, they could be more significant issue for Coalition in current situation, I wonder if it would be prudent to deal with them now before they grow even more?
The Soviet yards in Earth orbit survived. Starfire doesn't deal with radiation and dust at all, so I will be imposing restrictions on the population remaining on Earth (yes, there are survivors). Essentially, Earth is going to become a "Harsh" world, with a limitation of 800 population units, compared to the benign world with a limitation of 3,200 PU's that it was before. Also, it will take some time to recover. Less than it would in "reality", I admit, but it will take some time before it becomes a significant factor again, if ever.
As for the Tarek, well, the Wunderlanders have been pressing for a pre-emptive attack on the Tarek for years now. I wonder what will happen now that the Coalition is no longer around to stop them? <G>
Kurt