I disagree only with your last sentence. China is notoriously underhanded and mercenary when dealing with other nations. And yes, China will eventually make a move on Siberia, when the time is right. By contrast, the U.S. rebuilt much of Europe after WWII. Not all nations are the same.
Unfortunately, the U.S. is in a long period of moral decay, which began in earnest when the teaching of moral standards was removed from the public schools in the 1960's. But China is a completely alien culture that is quite devious and deceptive.