The Russian officials said it was unclear whether Mr. Tsarnaev and Mr. Plotnikov ever met in person.
"He intended to join the fighters, but he lost his contacts, " one of the Russian officials said.
Russian officials said it was carrying repaired attack helicopters that the Syrian regime would use for defensive purposes.
Russian officials said at least 52 cases were being processed when the ban was signed in late December.
Russian officials said Tito, who is divorced with three grown-up children, received the equivalent of a professional cosmonaut's training.
Russian officials said Mr. Tsarnaev also was in touch, most likely over the Internet, with another member of the underground.
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None of the 81 passengers and crew was injured in the emergency landing on a disused military airstrip on Tuesday, Russian officials said.
In its Wednesday review, Russian officials said they expect to decide whether to delay the launch by 10 hours to put it in the same orbital plane as the new station.
Russian officials have said they are not going to attend the ceremony because its ambassador has a previous commitment.
Russian emergency officials said the meteor was destroyed after it partially burned in the lower atmosphere over the Ural district.
Russian officials have said President Putin will take up concerns over the project with US President George W Bush at the forthcoming G8 summit in Genoa.
For example, in 2006, Russian environmental officials said that the owners of the huge Sakhalin-2 integrated oil and gas project had violated a number of environmental regulations.
Two Russian government officials said Tamerlan Tsarnaev exchanged notes over the Internet with William Plotnikov, a boxer who moved with his parents from Russia to Canada before joining militants in the North Caucasus.
The hookups with U.S. commercial spacecraft would have to be cleared with the Russians and the other partners in the space station effort, and Russian officials have said they need solid safety assurances about the commercial operations before giving the go-ahead.
Russian officials, he said, were not allowed to sit in on US cases involving the mistreatment of Russian children.
Russian migration officials have said they were puzzled that Tsarnaev applied for the passport but left before it was ready.
Officials from the Russian Investigative Committee said they are looking at poor fire regulations and short circuit as possible causes for the hospital fire in the Ramenskoye settlement.
The United States is liaising with the European Union, as well as Russian officials, on the issue, Nuland said in February.
The U.S. will monitor the Russian-Venezuelan training, said Pentagon officials who asked not to be identified as they are not authorized to speak on the information.
The US state department said it would help Russian officials make contact with the appropriate authorities in Texas, and that it "took very seriously the welfare of children, particularly children who have been adopted from other countries".
U.S. officials have said the FBI interviewed Tamerlan Tsarnaev in 2011 at the request of Russian officials concerned about possible contacts with militants but found no proof of suspicious behavior and closed the case.
The Kremlin said Russian security services gathered little information on Mr. Tsarnaev, but officials in the province of Dagestan said they tracked him during a six-month trip there in 2012.
Russia had indicated it could bail out Cyprus, but reports said talks between Russian and Cyprus officials have ended without any agreement.
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U.S. Secretary of State Madeleine Albright, meeting in Norway with Russian Foreign Minister Igor Ivanov, said U.S officials had not been able to confirm the report.
Speaking in Moscow, where he hosted league officials and several Arab foreign ministers, the Russian foreign minister said that sitting down at a negotiating table was the only way to end the conflict without irreparable damage to Syria.
Regional security officials said Wednesday that the targeted shipment included sophisticated Russian-made SA-17 anti-aircraft missiles, which if acquired by Hezbollah would enhance its military capabilities by enabling the militants to shoot down Israeli jets, helicopters and surveillance drones.
Russian officials made no subsequent request about Mr. Tsarnaev, the official said.
He said many Russian banks have links to organized crime and corrupt officials.
However, CNN contributor Tom Fuentes said the FBI would have found that information helpful after Russian officials asked the agency to look at Tamerlan Tsarnaev for signs of a possible shift toward increasing Islamic extremism.
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