USA: ’Russia is number one threat to USA’ - Four-star general

US Army General Mark Milley said that Russia stands as the greatest threat to the United States, in an address to the Defence One summit in Washington DC, on Monday. Jennifer Griffin, Fox News’ National Security Correspondent, interviewed Milley on a number of key areas. Video ID: 20151104-014 Video on Demand: Contact: cd@ Twitter: Facebook: LiveLeak: Vine: Instag