Roads Police. Know and obey the rules and you will have no problems.
Documents spot checks are very regular, routine feature of RUS and not sinister. If everything is in order they wish you a good journey.
If you have done something wrong I would recommend being prepared to 'negotiate' a cheaper and quicker resumption of your journey than the official way. If doing so, don't let them see your money - my Partners daughter keeps a separate purse in her car and opens it to show she has only about 500Руб (12 Euro), which they invariably take and tell her to go.
You should have an idea of the official penalties to not get ripped off! They are far lower than they initially will tell you.
But best of all - obey the rules of the country you are visiting.
In RUS obey all speed limits (they extend quite long distances after villages) and NEVER cross a continuous white line - not even to get to/from a fuel station on the other side of the road.

Docs. IDP plus original Drivers Licence to support it. Insurance certificates valid (and understandable) for all countries you will be in. Vehicle Registration docs plus a letter of Authority from owner as listed in Registration docs. Passport with Visas, Migration Card and Registration in RUS.
In RUS always have vehicle docs when using vehicle and carry personal docs with you at all times.

Borders. There is effectively only one, RUS/EU (or maybe Belarus/EU). Motos ride to the front of all queues. Not only is it common practice but encouraged by other drivers and officials. Otherwise patience at some. Worst for length of time is E22 near Zilupe, Latvia which I heard is to be closed in the future - if true, will be a disapointment as Latvia is building a new dual road to the border.

Worthy spots. It really depends what you want. Sea, scenery, sex clubs, history, lakes, forest, old towns/cities - they all have them all!

Outfit. It will be quite warm, average temperature probably 25-30, possibly more at times. Ventilated riding clothes but no thermals! There is nothing of any altitude where it could get chilly.

Belarus. No direct experience. A separate visa required. There is no patrolled or stopping border with RUS - it is open to ride/drive through rather like most EU countries, with no more than a sign. How that works for foreigners with Visa requirements is unclear to me. I understand it is a rather boring industrial wasteland to cross.


Finally, if starting in Moscow - take care. The driving style is unique, to put it mildly.
It works for them but is one hell of a culture shock to visitors.

Enjoy.

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