[piasa]

Like Russia did with the Boston Marathon?

[Navy Patriot]

The Russian government warned U.S. authorities that Boston Marathon bomber Tamerlan Tsarnaev was a violent radical Islamist more than a year and a half before the April 2013 bombing, but American authorities missed multiple chances to detain Tsarnaev when he was traveling to and from Dagestan for terror training

The early (and non public) warning (by the FSB) indicates earnest anti terrorist cooperation by Russia without ulterior motives, as the time allowed full investigation by the FBI and the discovery of who financed and directed the Tsarnaev Brothers.

The FBI blew it off because they liked Chechens killing Russians.