Boston Marathon bombing

==== Russian reaction ====
The [[Government of Russia|Russian government]] said that special attention would be paid to security at upcoming international sports events in Russia, including the [[2014 Winter Olympics]].<ref name="AutoLC-149" /> According to the Russian embassy in the U.S., President [[Vladimir Putin]] condemned the bombing as a "barbaric crime" and "stressed that the Russian Federation will be ready, if necessary, to assist in the U.S. authorities' investigation".<ref name="AutoLC-150" /> He urged closer cooperation of security services with Western partners<ref name="AutoLC-151" /> but other Russian authorities and mass media blamed the U.S. authorities for negligence as they warned the U.S. of the Tsarnaevs.<ref name="Russia-could">{{cite web|url=http://www.rg.ru/2013/04/26/mnenie-site.html |script-title = ru:Россия могла предотвратить теракт в Бостоне |trans-title=Russia could have prevented a terrorist attack in Boston|author=Shestakov, Yevgeny|work=Rossiyskaya Gazeta|date=April 26, 2013|access-date= April 11, 2015|language=ru}}</ref> Moreover Russian authorities and mass media since the spring of 2014 blame the United States for politically motivated false information about the lack of response from Russian authorities after subsequent U.S. requests.{{citation needed|date=February 2017}} As proof a letter from the Russian FSB was shown to the members of an official U.S. Congressional delegation to Moscow during their visit. This letter with information about Tsarnaev (including his biography details, connections and phone number) had been sent from the FSB to the FBI and CIA during March 2011.<ref name="Russia-blame-again">{{cite web|url=http://ria.ru/boston_terror/20140410/1003329322.html |script-title = ru:Эксперт: обвинения США по делу Царнаева политически мотивированы|trans-title=Expert: U.S. blame around Tsarnaev case are politically motivated|author=Korotchenko, Igor|work=RIA Novosti |date=April 10, 2014|access-date= April 11, 2015|language=ru}}</ref>

Republican U.S. Senators [[Saxby Chambliss]] and [[Richard Burr]] reported that Russian authorities had separately asked both the FBI (at least twice: during March and November 2011) and the CIA (September 2011) to look carefully into Tamerlan Tsarnaev and provide more information about him back to Russia.<ref name="BG-RUS">{{cite web|url= https://www.bostonglobe.com/news/nation/2013/04/23/russia-contacted-fbi-multiple-times-concerns-about-alleged-boston-marathon-bomber/ND0bhUdq1Tp1mRuC8xlb8N/story.html|title= Russia contacted US government 'multiple' times|author1= Bender, Bryan|author2= Bierman, Noah|work= The Boston Globe|date= April 23, 2013|access-date= March 27, 2017|archive-url= https://web.archive.org/web/20170613234646/http://www.bostonglobe.com/news/nation/2013/04/23/russia-contacted-fbi-multiple-times-concerns-about-alleged-boston-marathon-bomber/ND0bhUdq1Tp1mRuC8xlb8N/story.html|archive-date= June 13, 2017|url-status= dead}}</ref> FSB secretly recorded phone conversations between Tamerlan Tsarnaev and his mother (they vaguely and indirectly discussed jihad) and sent these to the FBI as evidence of possible extremist links within the family.{{citation needed|date=July 2020}} However, while Russia offered US intelligence services warnings that Tsarnaev planned to link up with extremist groups abroad, an FBI investigation yielded no evidence to support those claims at the time. In addition, subsequent U.S. requests for additional information about Tsarnaev went unanswered by the Russians.<ref>{{cite news|last=Radia|first=Kirit|title=Lawmakers Traveling to Russia to Investigate Boston Bombing|url=https://abcnews.go.com/blogs/headlines/2013/05/lawmakers-traveling-to-russia-to-investigate-boston-bombing/|newspaper=ABC News|date=May 21, 2013 |access-date= April 11, 2015}}</ref>{{Failed verification|date=April 2023|reason=No mention in reference of unanswered requests.}}