The Russian conquest of Siberia was accompanied by massacres due to indigenous resistance to colonization by the Russian Cossacks, who savagely crushed the natives. At the hands of people like Vasilii Poyarkov in 1645 and Yerofei Khabarov in 1650 some peoples like the Daur were slaughtered by the Russians to the extent that it is considered genocide. 8,000 out of a previously 20,000 strong population in Kamchatka remained after being subjected to half a century of Cossack slaughter.