Vladivostok-Mongolia-Europe in Winter

[Panmundo-Tobias]

Hello everybody!
Not because I am over the edge adventureous but because my time is running out, I will travel with my Land-Cruiser from East to West through Russia and Mongolia starting in early February 2008 (so far I have been on the road for 18 months - check PanMundo.Com)

I plan to take the route from Japan to Sakhalin and then down to Khabarovsk (alternatively via Valdivostok) and on to Ullan-Ude and into Mongolia. I am in no big hurry, but would like to reach Switzerland by mid April latest.

Some questions:

1) Does anybody have experiences with driving through Russia in winter?
2) What about the road construction sites between Birobidzhan and Chita in winter?
3) What about frozen Diesel? (and what to do against?)
4) And is it possible to drive up to Yakutsk in winter?
5) Will it be possible to drive through Mongolia (Ulaanbaatar-Altay-Biysk)?
6) Is there anybody outthere how will travel in that region at the same time?

I am imagining it to be beautiful - yet somewhat cold. Also I thought that driving in winter might spare me the deep mud wholes I would encounter in spring.

I would appreciate you help!
Cheers from currently Phnom Phen, Cambodia (at 36° C),
Tobias