Mirziyoyev, 59, has served as prime minister from 2003 under Karimov, who died of a stroke in September having run Central Asia`s most populous nation, a former Soviet republic, for 27 years.
Mirziyoyev swiftly emerged as the likely successor to Karimov, getting appointed interim president when the senate speaker, given that role by constitution, gave it up in Mirziyoyev`s favor.
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