Russia could be a threat to the US, but they don't want to be. I really doubt it because the people who run Russia today are not the Bolsheviks who took over and ran Russia for a long time, killing well over half of the population during that time. It was Germany who saved Europe and others from that Bolshevik threat that invaded Russia. It wasn't the Russians attacking people, but the Bolsheviks who took over their military and forced them to or they would starve. They implemented extreme communist measures to the point that the entire USSR collapsed, and a return to some of the previous leadership began. Not saying that all of it has been removed or that only the good remain now, but today's Russia is radically different from the one during the 80's. Still very strong, but with a more cool composure and understanding when not being attacked from every side and having to defend against it and attempt to reclaim their country. In fact, they seem to fear for America now because they see that same thing happening to Americans under Obama currently a little at a time.
I would be more worried about the threat that is imitating a president right now than Russia. I'm more worried about China and North Korea since NK has nukes and has been firing and testing them just a few days ago despite the UN and the US forbidding it. China was very quiet and acted like it wasn't supposed to be talked about. There's a problem there, and it's one that the communist-in-chief won't ever address because he's one of them. That's what I'm worried about. Not Russia.