hanoi prosecutors vietnam thursday say seek death sentence embezzlement case former chairman state energy firm petrovietnam communist country step one big corruption crackdowns high-ranking political officials punish investigations widen petrovietnam bank sector dozens bank energy officials face trial charge embezzlement mismanagement abuse power statement supreme people procuracy vietnam say seek death sentence former chairman nguyen xuan son charge include wrongdoing serious economic consequences abuse power usurp assets urge overall penalty death list punishments jail term 16 18 years flout state rule economic management life imprisonment abuse power seek death sentence embezzlement 2009 petrovietnam acquire 800-billion-dong 35-million stake ocean group bank unit ocean bank completely write 2015 central bank take cost son could reach comment trial reuters could immediately reach lawyer prosecutors also seek life imprisonment ocean group founder tycoon ha van tham charge range embezzlement abuse power statement say add dozens ocean bank staff could also face years jail ocean group interest real estate finance hotels infrastructure say comment sentence seek tham reach still trial police open three new case state firm units among russian joint venture vietsovpetro vietnam sole refinery operator binh son refine petrochemical petrovietnam exploration production corp. three case focus allege abuse power usurp assets link violations ocean bank vietnam police say statement website thursday police add another accusation abuse power petrovietnam vice general director ninh van quynh add follow arrest prosecution month allege wrongdoing quynh could contact comment fresh charge trial last week former central bank governor prosecute allege lack responsibility dinh la thang former petrovietnam chairman remove powerful politburo last month vice trade minister sack vietnam seek death penalty embezzlement ex-chairman state energy firm