According to one report, the Department of Homeland Security has requested Russian troops to be at the ready in case of an emergency on US soil.

According to the FBI, they interviewed suspected Boston Marathon bomber Tamerlan Tsarnaev in 2011. It was their determination at that time that he posed no threat. However, the Senate Intellegence Committee learned in a closed briefing on Tuesday that the Russian authorities alerted the US government multiple times about their concerns regading Tsarnaev.