Voltar,
Please don't let us down! True, in this game, Russia looks to be alone at the moment. However, even IF France-Austria-Prussia-Sweden attacks, Russia can survive it. Maybe the coalition partners fall out with each other, maybe Britain resurges - who knows?
However, even IF Russia does lose in this game, and you get no Tournament VPs, it is still worth fighting.
1) Because it could be fun. Just imagine you are playing Russia in 1812, with all of Napoleonic Europe against you. In game #2 the Coalition is really up against it, against the 1st and 2nd land powers and the 2nd, 3rd and 4th naval powers, but this is the game I am enjoying most at the moment!
2) Because if you abandon Russia to the AI, there will be a feeding frenzy as everyone tries to break off a piece. Austria and Prussia (and perhaps Sweden) will be at a great advantage, and will gain an unrealistically high number of VPs. This will distort the whole tournament, perhaps.
Could you just play on for a bit? You're not even being attacked yet! Maybe the combination against you - if there is one - won't be as bad as you think if it comes to war.