Nine suspects accused by the US of spying for Russia face hearings in federal courts to request their release on bail.
They were part of a group of 10 suspects arrested on Sunday in Boston, New York and the Washington area accused of belonging to a spy ring.
The alleged agents are suspected of posing as ordinary citizens to collect information for Russian intelligence.
US police moved on the group after an investigation of more than 10 years.
An 11th suspect has disappeared in Cyprus after a judge there released him on bail.
The man, a Canadian passport holder, was named by police as Christopher Metsos. He was due to sign in at a police station in the coastal town of Larnaca on Wednesday but did not show up.
He was held at Larnaca airport on Tuesday as he tried to board a plane to Budapest, a day after the US said it had held 10 other suspects.
Mr Metsos was awaiting a hearing for extradition to the US.
Aged 54 or 55, he is depicted by US prosecutors as the alleged spy ring's shadowy money man, visiting the US as early as 2004 to deliver bags of cash to its members.
Accused of money laundering, he was released on bail of 26,500 euros (£21,700; $32,500) to await an extradition hearing scheduled for 29 July.
Cyprus has issued an arrest warrant for him on Thursday but police were not certain whether he remained on the island.
'Femme fatale' The 10 suspects held in the US are accused of conspiracy to act as unlawful agents of a foreign government, a crime less serious than espionage but which carries up to five years in prison.
Most of them are believed to be Russians living under false names.
Nine are scheduled to appear before federal courts on Thursday to have their requests for release on bail to be heard.
The 10th suspect, using the name Anna Chapman, had her bail request denied on Monday.
Continue reading the main story
Russian press on spy row Ambivalent US-Russia ties Russia's 'spies' in the 'burbs
Donald Howard Heathfield and Tracey Lee Ann Foley are to appear in Boston, where they were arrested after more than 10 years of surveillance by US police.Michael Zottoli, Patricia Mills and Mikhail Semenko are to appear in Alexandria, Virginia, near Washington.
Richard and Cynthia Murphy, Vicky Pelaez and Juan Lazaro are to appear in a New York City court.
Ms Chapman, 28, has been painted as the femme fatale of the alleged spy ring, with several glamorous photos posted on her page on Facebook.
US prosecutors say they posed as ordinary citizens, some living together as couples for years.
They were trained by the SVR Russian intelligence agency to infiltrate policymaking circles and collect information, according to papers filed in New York.
Russia, which initially reacted angrily to the US charges, has said it does not expect the incident to harm relations.
Moscow has confirmed that some of the suspects are Russian and Foreign Ministry spokesman Andrei Nesterenko said diplomatic help would be offered to them.
BBC
Comments