qnli question: When did Boris Arkadievich Malyarchuk use a sample of Czech individuals to determine the frequency of "Monigoloid" "mtDNA lineages"? sentence: Malyarchuk said the "Russian population" was developed by the "assimilation of the indigenous pre-Slavic population of Eastern Europe by true Slavs" with additional "assimilation of Finno-Ugric populations" and "long-lasting" interactions with the populations of "Siberia" and "Central Asia".