Russia is an extant threat to destabilization of governments around the world not due to their nuclear arsenal, but due to their far more successful efforts in weaponizing cyber attacks and social media disinformation campaigns that serve to undermine elections and social stability of nations around the world. They have proven that they are not afraid to attack vulnerabilities in various infrastructures thereby causing disruption of services across various public and economic service sectors.
China has been arguably slightly more restrained in this regard, but is not far behind and probably no less capable.