0906 GMT January 22, 2022
Truong Duy Nhat, a regular contributor to Radio Free Asia, was found guilty in a brief trial on Monday of defrauding the public of $560,000 when he worked for a state-owned newspaper in the central city of Danang in 2004, state media said, according to AFP.
Describing the sentence as "harsh and totally unacceptable", Reporters Without Borders (RSF) called for the "immediate release" of Nhat who had posted articles critical of the government on his blog.
RSF ranked Vietnam 176th on its 2019 World Press Freedom Index as one of the world's biggest jailers of journalists and bloggers.
"Officially convicted of abusing his professional position, he is in fact paying dearly for his professionalism," said Daniel Bastard, RSF's Asia-Pacific director.
Radio Free Asia also condemned the conviction as "unjust" and "a blow against free speech and free expression."
All media in Vietnam is state-run and independent journalism and bloggers are banned.
Since its hardline leadership took power in 2016, the country's single-party state has tightened its grip on criticism and different viewpoints.
This is Nhat's second prison stint. He was jailed for two years in 2014 for "abusing democratic freedoms" for critical blog postings.
He was discovered in a Vietnamese prison in March last year after fleeing to Thailand seeking refugee status with the UN High Commissioner for Refugees.
The circumstances of Nhat's return to Vietnam were never clarified by Hanoi.