the problem with Urals is not the age of a bike you gonna buy but quality of production in general. parts are cheap but not always easy to find. be ready to fix it yourself or at least try to study the construction to understand what you need in case of total stop - a new cilinder head or just pistons. be ready to go under 100km/h ALWAYS (that will be a real mental problem when you reach european part of the country especially Msk and further). be ready to permanent oil leaks. be ready to overheating ( that's why you should not buy a brand-new one - first 1500 km it heates like hell and you can't load it).
but tires are cheap and one set will bring you to europe .
sorry, not europe but Russia's border - it could be a problem to exit the country with a letter of attrney. as i know the must be a special note in the leter reading you can take the vehicle across the border. it does work with russian citizens riding russia-registerd bikes but in your case i'm not sure. you'd better ask the question to custom officers in Vladik when coming in. if not allowed to cross the border the shortest way will be to Baltic states - there you'll be able to sell Ural to locals at the border and enter EU on your feet
and - in Vladik it's much easier to buy a japanese bike then russian one. we say Primorye (Vladik region) is not Russia -or just absoutely another Russia.