The Communist country decided in 2011 to switch from firing squads to legal injection on humanitarian grounds, reportedly because of the trauma caused to the shooters. But it had been unable to execute anyone because the European Union bans factories from exporting drugs.
The country amended laws this year allowing the production of local chemicals to be used in executions, but the source of the drugs used in Tuesday's execution was unclear.
Nguyen Anh Tuan, a 27-year-old man condemned to death in 2010 for murdering a woman, was executed in a Hanoi prison on Tuesday.
There are currently 586 people on the death row in Vietnam, a paper said. Amnesty International said it was saddened to hear of the resumption of executions.
"We regret that authorities in Vietnam have exercised the opportunity to review the death penalty in line with debates in other Southeast Asian countries," said Chiara Sangiorgo, the group's campaigner against the death penalty.

"Instead of devising a better way of execution, they could have concentrated their efforts in launching a national debate with a view to abolition," he added.
Vietnam allows for the death penalty for 21 crimes including drug smuggling, embezzlement, treason and subversion.


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