Nastase's wife also was placed on three years of probation for using false documents.
In return, the agency said, Nastase named Jianu as head of the construction agency.
Corruption and inertia, the twin foes of Romania's reformers, could yet undo Mr Nastase.
But Nastase, of Brown University in Providence, Rhode Island, says there is something unusual about it.
He accused President Traian Basescu, who defeated Nastase in the 2004 election, of being behind the scandal.
But Nastase's lawyer, Ioan Cazacu, said he will appeal the decision to the European Court of Human Rights.
Romania's Supreme Court found Nastase guilty of committing blackmail while he was prime minister, from 2000 to 2004.
But a different, friendlier president might pardon Mr Nastase, whose supporters say the whole case was trumped up.
Nastase served as Romania's premier from 2000 to 2004 and remained an important figure in his Social Democrat Party.
The trial of Nastase and his wife started in 2010 after Romania's Anti-corruption Agency accused them of bribery and blackmail.
Horatiu Nastase says his calculations show that the core of the fireball has a striking similarity to a black hole.
Once the votes had been counted, outgoing Prime Minister Adrian Nastase graciously conceded and opposition leader Traian Basescu claimed victory.
"He looks terrible, " Prime Minister Victor Ponta told reporters after visiting Nastase in the hospital, which did not release Nastase's condition.
Nastase won't be allowed to run for or serve in public office for two years after he completes his prison sentence.
Their wake-up call was the conviction on corruption charges of Adrian Nastase, a former prime minister, who is now in jail.
The Supreme Court found Nastase and his wife innocent regarding these accusations.
The trial started in January 2009, after Nastase was accused of using his political influence as a party leader in his own interest.
Nastase was the first former prime minister and the highest official to get a jail sentence in Romania since the fall of communism.
In a separate case, Nastase was placed on three years of probation in March after he was convicted of committing blackmail while in office.
The agency said the money was meant to be used in China for the purchase of various goods and objects for the Nastase family.
Still, Mr Nastase has shown that Romania's creaky machinery of government can be just about made to work, if the political will is there.
An ex-prime minister, Adrian Nastase, has just been sentenced to two years in jail for fraud (part of a vendetta by Mr Basescu, say his supporters).
Nastase's lawyer, Ion Cazacu, said he might appeal the decision.
Bucharest, Romania (CNN) -- Former Romanian Prime Minister Adrian Nastase was placed on three years of probation Friday in a corruption case that had been under investigation for more than six years.
The Public Ministry said in a news release that Nastase, 61, shot himself in the neck late Wednesday night, when a police team arrived at his residence to inform him of his arrest.
In 2011, it launched a global "Why I Love Romania" poster campaign, trumpeting the achievements of famous Romanians such as tennis player Ilie Nastase, gymnast Nadia Comanenci and scientist Nicolae Paulescu, who discovered insulin.
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