If you are riding from UK to Vladivostok to get the DBS ferry to South Korea then road tyres will be OK as almost all the route is tarmac. There are some stretches of roadworks which are effectively dirt but you shouldn't need off road tyres if you are sticking to the main highway.
If you are going to go into Mongolia or ride up to Magadan you will probably need some knobblies.
The days of Mondo Enduro type Trans Siberian highway is now a distant memory unless you head off and do a Sibersky Extreme route (BAM etc)
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