Putin and Obama spoke by telephone today at the US president's initiative, the aides were quoted as saying by Russian news agencies.
Kremlin foreign affairs adviser Yuri Ushakov said the conversation focused on "the problem of intensifying cooperation of the special services in the context of the recent terror act in Boston." The suspected bombers hail from a Russian region troubled by militancy.
Ushakov was quoted as saying "practical agreement was reached on very active contacts."