China isn't a military threat, but Russia has proved that military power isn't necessary to sow chaos and destabilize the US. You don't even need military-grade hackers.
Russia has "destabilized" the US? That is hyperbole at best, unless you know something I don't. What exactly are you referring to? They seem to have destabilized the US media, in the sense that they can't publish enough stories about Russia. But have they actually achieved anything in any real way?