Pentagon calls Russia main US threat

The Pentagon called Russia to be a global threat to the US. According to the Defence Secretary Ashton Carter, Moscow ranks first on the list of global strategic challenges for the US security. Then follow China, North Korea, Iran and terrorism.
Ashton Carter noted that Russia and China are rivalries, that have already developed and keep developing military systems, which are aimed at threatening the US superiority in some fields.
Carter claimed that, the Pentagon is guided by namely these challenges while drawing up the military budget for 2017.
In order to resist the challenges, the US Defence Ministry needs over $582 dollars.