Moscow - Russian President Vladimir Putin has offered his country's assistance in investigating bombings in Boston that killed three and injured more than 140 people.
Putin said in a condolences note published on the Kremlin's website on Tuesday that the international community should come together to fight terrorism.
Putin said Russia "would be ready to provide assistance" to US authorities with the probe into the bombings at the Boston marathon.
Obama's national security adviser Tom Donilon met with Putin on Monday and presented a letter from Obama in an effort to improve relations, which have nosedived in recent months.
Despite Obama's efforts to "reset" relations with Russia during his first term, ties worsened over conflicting approaches to the Syrian crisis and US concerns about the Kremlin's crackdown on dissent.
Serious warning bell
Russia's sports minister on Tuesday said the blasts were a warning for Russia as it prepares to host the 2014 Winter Olympic Games.
"For Russia, which will have to soon stage a number of major sporting events, this is a serious warning bell," RIA Novosti quoted Vitaly Mutko as saying.
Besides the 2014 event in the Black Sea resort of Sochi, Russia will also host the University Games in Kazan later this year, as well as the 2018 Football World Cup.
The Sochi Games will be staged on the edge of the restless North Caucasus, where Russia waged two post-Soviet wars in Chechnya, and where violence is prevalent in nearby Dagestan.
Mutko said Russia was "very worried" about security at all the sporting events.
"We will be devoting special attention to it," he said.