This would be a brilliant move on the part of the Russians. The tunnel and the industry that would follow it would consolidate Russian influence in the Pacific Rim and diminish the power of China and Japan as Russian goods could be shipped faster and cheaper to the Americas and vice-versa.
It would also lessen tensions between the USA and a nationalistic Russia by increasing trade and tourism between the two. Likewise, the prospect of rail travel from New York to London would be bloody amazing!
![Drink up [B-o]](./images/smilies/drinkup.gif)
I agree to lessen tensions between a nationalistic Russia and us would be good, to do this at the expense of China is even better.