Last month it gave Mr Cubas three days to send his buddy back to jail.
Many of the officers promoted under Mr Cubas were said to be loyal to General Oviedo.
Fu signed a military cooperation agreement with Havana aimed at modernizing Cubas outdated Russian weapons.
Secondly, Mr Cubas has to establish whether he wants to be president or puppet.
Congressional leaders were this week planning to revive an attempt to impeach Mr Cubas.
His running mate, Raul Cubas, was elected instead and ordered Mr Oviedo's release.
BBC: Paraguay candidate Lino Oviedo dies in helicopter crash
Mr Cubas ordered Paraguay's borders and airports shut, supposedly to find the killers.
Mr Cubas's opponents lack the two-thirds majority in Congress required to remove him.
In parallel, a special Colorado convention on March 2nd may decide to expel Raul Cubas Grau, the general's vice-presidential nominee.
One way out might be a deal between Mr Cubas and the opposition to find a way of reducing General Oviedo's sentence.
Even so, Congress is in no hurry to help Mr Cubas by approving urgent laws to shore up the shaky financial system and proceed with privatisation.
Order was restored when Mr Cubas called out the army (and sacked the police chief), but that brought another fear, of a military coup against Congress.
He seemed to greet his new status as another trophy, saying he wanted to serve out the remainder of Mr Cubas's term, which lasts until 2003.
All this defiance has prompted the Supreme Court to order a prosecution of Mr Cubas himself, and Congress to renew a somewhat desultory effort to impeach him.
In his inaugural speech, Mr Cubas made a good impression on a country where democracy has struggled to put down roots since General Alfredo Stroessner's 35-year dictatorship ended in 1989.
China also recently agreed to modernize Cubas telecommunications network.
But for the courts, it was he, not the little known Mr Cubas, who would have been elected president last May, and even as a second-best Mr Cubas took 54% of the vote, in the cleanest election in Paraguay's history.
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