U.S. lawmakers have expressed frustration at Russian authorities for not sharing more with their U.S. counterparts.
In 2011, Russian authorities alerted the United States to concerns that Tsarnaev was becoming increasingly radical.
Russian authorities had raised concerns to U.S. authorities about her and her son, sources told CNN.
The Russian authorities have said they will try to recover the bow next year.
Russian authorities, especially in Moscow, regularly throw out traders from Georgia and elsewhere in the Caucasus.
As well as internal wrangles, BP employees at TNK-BP have fallen foul of Russian authorities.
The Russian authorities were criticised by MEPs from across the political spectrum for banning several opposition parties.
The Russian Federal Security Service spokesman said he had no immediate information about Russian authorities contacting the FBI.
Like Berezovsky, Patarkatsishvili was on the run from the Russian authorities, who charged him with fraud in 2002.
According to documents filed with the Russian authorities, Stroytransgaz is largely owned by relatives of Gazprom's top management.
The Russian authorities maintain the violence is encouraged and funded by militants abroad.
Russian authorities have said they are pursuing their own investigation into the death.
The Russian authorities accuse Ms Tymoshenko, a former gas industry oligarch, of bribery and are pursuing a criminal case against her.
Rogers told NBC the agency "did their due diligence" but Russian authorities "stopped cooperating" when the United States sought further clarification.
Russian authorities asked U.S. officials to investigate Tsarnaev before the trip, saying they believed he was becoming increasingly involved with radical Islam.
CNN: 4 dead, 44 hurt in Dagestan bombing, security officials say
Russian authorities asked U.S. officials to investigate Tamerlan before the trip, saying they believed he was becoming increasingly involved with radical Islam.
CNN: Suspect: Boston bombing was payback for hits on Muslims
On two occasions before that -- in March and late September 2011 -- Russian authorities asked U.S authorities to investigate Tamerlan Tsarnaev.
Russian authorities say more than 1, 500 people were hurt, mostly by flying glass, when the Chelyabinsk meteor exploded in spectacular fashion.
The Sokolov archives were handed over to the Russian authorities by Prince Hans Adam of Liechtenstein in September, allowing a detailed comparison to be made.
The Russian authorities had requested Mr Berezovsky's extradition to face fraud charges.
Our understanding is that the Russian authorities would have liked to get their hands on Dudley and get his signature on some documents.
Russian authorities told U.S. officials before the bombings they had concerns about the family, but only revealed details of wiretapped conversations since the attack.
Both U.S. and Russian authorities are trying to learn more about Tamerlan Tsarnaev's activities while staying in Russia from January to July of 2012.
After the bombings, Russian authorities told U.S. investigators they had secretly recorded a phone conversation in which Zubeidat had vaguely discussed jihad with Tamerlan.
It's unclear what came of the parents' talk with U.S. and Russian authorities, though both parents had publicly insisted that their sons are innocent.
Last September the United States Agency for International Development (USAID) announced it had been ordered by the Russian authorities to shut down its operations.
BBC: Russian police raid rights group Memorial and other NGOs
However, Mr Magnitsky and Mr Browder were charged with tax evasion in the wake of Mr Magnitsky's offer of evidence to the Russian authorities.
The Russian authorities have launched an investigation after a man was killed during a ride down a ski slope inside a giant inflatable ball.
The Russian authorities had alerted US counterparts to the activities of Tamerlan Tsarnaev, whose family has its origins in the war-torn Russian republic of Chechnya.
Russian authorities asked U.S. officials to investigate Tamerlan Tsarnaev some months before the trip, saying they believed he was becoming increasingly involved with radical Islam.
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