The US State Department complained on Thursday that Cuba has refused to seriously discuss the release of US spy Alan Gross.
Cuban Foreign Ministry official Josefina Vidal had said on Wednesday that her country was prepared to negotiate and was awaiting a US response.
Mr Gross was working for a USAid-funded programme when he was arrested in 2009 at Havana's Jose Marti airport. He claimed that he was providing internet to the island's Jewish community.
But Cuba noted that Mr Gross was carrying sophisticated communications equipment. He was sentenced to 15 years for spying.
Previously, Cuban officials have raised the case of the Miami Five, who are serving long jail terms in the US, though they have not spelled out that they are seeking an exchange.
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