Passage: Another state ruled by the Shaybanids was the Khanate of Sibir, seizing the throne in 1563. Its last khan, Kuchum, was deposed by the Russians in 1598. He escaped to Bukhara, but his sons and grandsons were taken by the Tsar to Moscow, where they eventually assumed the surname of Sibirsky. Apart from this famous branch, several other noble families from Kyrgyzstan and Kazakhstan (e.g., Princes Valikhanov) petitioned the Russian imperial authorities to recognise their Shaybanid roots, but mostly in vain.

Question: What happened to Kuchum?
He escaped to Bukhara