You will need a visa for Russia and the non-EU countries beside Eastern Europe. Some of these must be arranged well in advance I believe.
You should also check what documentation is required for your bike in each country you intend to travel through. Check that the dates on all documents covers the time you will be in the country for.
There is a paperwork section in the PLANNING area of this website that gives country guides but you should also check if there have been changes made to the requirements in recent years/months.
Have fun.
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