Originally Posted by The Doctor
True, but the Empire isn't in any hurry to stand up to the Thalmor either. I'm pretty sure it was Mahatma Gandhi who said: "To believe something, but not live it, is dishonest".
If you break into the Embassy, you'll see that while the Thalmor want the Civil War to go on as long as possible, they do consider a Stormcloak victory preferable to an Imperial one.
Also, Ulfric is their unwitting puppet.
And I see it as both the Empire and the Thalmor playing the long game against each other.