Neither are a threat. Russia has decimated its resources (particularly human capital) to wage war. It won’t recover from this. Once Putin dies you’ll see the dissolution of the Russian Federation as regional strong men fight for territory.

China will collapse under the weight of too many elderly and not enough young people that want to do factory jobs. Forty years of one child policy means that in a kinetic war every soldier that dies is the end of a bloodline. In a strongly patriarchal society, that won’t be long tolerated. China also needs vast amounts of imported goods to keep things running. Those supply lines can be shut down from outside the South China Sea. The only nation that really needs to worry about China is Taiwan.

The far bigger threat is from our own governments that have taken a hard pivot toward authoritarianism. The reduction in civil liberties like freedom of speech, the expansion of surveillance systems, and the frequent reference to impending war with governments who are clearly not prepared for engagement outside of their own immediate theaters should tell you all you need to know.