What pushed the Tsardom of Russia into going east of the Urals, starting the long conquest of Siberia in 1582 ? | AskHistorians Archive Observer

What pushed the Tsardom of Russia into going east of the Urals, starting the long conquest of Siberia in 1582 ?

by RutilantBoss

AyukaVB

The topic was briefly touched in the follow-up question answers by u/Chamboz here:https://www.reddit.com/r/AskHistorians/comments/8kn2mh/why_was_the_steppe_trade_route_replaced_by_the/