Don't know about the other countries, but I can give you some tips for Russia... Did Vladivostok to London last year.
Step 1. Check your passport. Is it valid for the entire length of the trip plus at least 6 months after the date of your return? DO THIS RIGHT NOW
Step 2. Do you have enough pages in your passport for all of the visas needed, plus a few spare for stamps? DO THIS RIGHT NOW.
Step 3. Go to WayToRussia.Net - A Guide to Russia and Travel Services Directory - Moscow and St. Petersburg Guide, Trans-Siberian, Baikal, Russian visa, apartment rentals and more
and apply for a bussiness visa. You will be free to roam wherever you like. You just need to pay the money. When they ask why you'll be going to Russia, say that you'll be looking for investment opportunities or whatever you like. They will ask you for the first 6 cities that you intend to visit. Read the info here: Types of Russian visa and Russian visa laws: a tourist russian visa, a business visa, a student visa, a personal visa, a short 72 hour visa, transit visa -- WayToRussia.Net Guide to Russia
Step 4. Get an HIV test and note from your doctor (include doctors contact details - and preferably a stamp!) to say you don't have HIV.
Step 5. Photocopy everything.
Step 6. Send money (most important), invite, passport, HIV test and application form (probably available from embassy website) to your embassy. Also include a registered post bag if you want your passport to be returned via registered post.
Step 7. Nervously await return of passport.
Step 8. Assemble documents.
8.1 International Driving Permit.
8.2 Home country drving licence.
8.3 Passport containng visa
8.4 Motorcycle registration and ownership documents.
8.5 Something to show you've paid your road tax in the country where your vehicle is registered.
8.6 Your HIV certificate
8.7 Photocopy of your invite (the embassy will keep the original - be sure to get a copy beforehand).
8.8 Bank statement showing that you've got enough money in your account to realistically be able to survive in Russia for the time specified on your visa.
8.9 Home embassy contact details. Other contact details. Credit card (visa is the most useful) some cash, a few US dollars.
8.10 Receipts for any items of value or perceived value
Step 9. Ride to Russian border and fill out declaration in duplicate. Make sure that both forms are exactly the same - this form is available in English and includes sections on your vehicle, cash that you're carrying and other valuables. Be ecconomical with what you put!
Step 10. You may need to pay a "Service fee" at this point. Best not to offer unless they specifically ask.
Step 11. Your customs guy will enter details into the computer and print off a certificate saying that you are temporaraly allowed to drive in Russia. We got a certificate that expired on the same day as our visa, so did not have to get it renewed. Other people that we met only got certificates that lasted for two weeks and they had to apply at the police station to get it exteneded. In particular we met a couple of Germans who spent most of their holiday looking for the right office to get their vehicle documents extended. If they only give you a two week ticket, ask if you can get it for longer. This may cost you some money.
Step 12. Purchase insurance. Don't even bother trying to get insurance before you get to Russia. Insurance in Russia is not what it is in Europe and isn't taken very seriously. We never got asked for our insurance papers. Don't worry about it. There's a good chance that your insurance won't be worth the paper its printed on. When I asked the insurance lady about claims (while filling out the documents) she advised me not to have an accident. Insurance is a European/North American invention if you get my drift.
Step 13. Ride to a hotel for your first night and register.
Step 14. Ride around wherever you want.
Step 15. After 2 to 3 weeks, ride to a hotel and register.
Step 16. Repeat steps 14 and 15.
Step 16. Ride to hotel on last night in country and register.
YOU DO NOT NEED A CDP
Other points - gas is everywhere.
Check my GPS waypoints on my previous post It has locations of over 150 gas stations and a whole lot of other useful info. My range was 210 km tops and I rarely went beyond 150.
GPS map: go to Smellybiker's Wanderlust Worldmap • Index page
and purchase bob's world map. Best money you'll ever spend. (Provided you have a garmin mapping unit such as the GPSMAP60CSx of course!)
GPS in Russia 100% legal. Garmin and other units can be purchased in any city. The cops and locals love gps. They yell 'Sputnik Sputnik' every time you pull it out. Don't need to do no smuggling.
Things you don't want to take:
1. Heaps of cash. ATM's will accept most credit cards anywhere. Otherwise hotels and banks will be able to give you an advance on your credit card. Cirrus and Maestro cards also work at most ATM's.
2. Things you can't afford to loose. E.g you great grandfathers watch. Buy a cheap digital unit for the trip.
3. Expensive electronics e.g .cameras, laptops. Dust and water gets into everything. It is unavoidable. Unless IP67 rated, forget it.
You will get searched. Do not take anything illegal or that could cause embarrassment.
A very good map is the 'Auto atlas of Russia'. Available at most of the bigger gas stations. Of course you want to look at the map before you go.
Go to Russia maps from Omni Resources, world leader in map supply.
search the page for 65-31904 The map is about $40.
The map has got a red cover.
Please email me and I'll give you some more details about the documents.
russiantraverse <AT> gmail <DOT> com