There are two border crossings...Altubulag and Sukhbataar that will get you to UB from Russia on the main road. Either was available to vehicles in July 2007...be prepared for a wait if you're not on a moto.
The one out west in Tsaangur is easy but not quick. If the Russians and Mongolia border officials could coordinate their lunch and sieste times, it would be quicker...but don't hold your breath...just enjoy the sky...stunning!
HTH
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