In 1990, PRC was in ranks with Zimbabwe, it did not dream attacking anybody. Instead, it was begging Taipei, and Hongkong for aid, because it was the need of the day.
In 2020, PRC no longer begged Hongkong for credit lines. It just walked in, and put their agents into HK police under gunpoint because it no longer needed HK for anything.
The needs have changed, and thus wants too.
Who knows what is really in the head of Pooh Bear but when a man has absolute power and has eliminated all enemies and alternative thought you really think rational analysis of pro / con enters his decisions thinking.
When Russia was broke, it was only able to try to invade its breakaway region. It could not have dreamed of anything else.
When Russia was no longer dying from hunger, it invaded a completely broke country of Tajikistan. It could not have dreamed of anything else.
When Russia recovered from crisis, it attacked Chechnya again. But so far, it was again, the limit of its ambition...
At each stage, different thoughts, and desires for consideration of each attacks went through heads of Russian generals, but in the end the result is still a military attack.
China doesn’t dream of world domination, just regional domination.
This logic is what basically started the WW2. If America will keep backing off, and beg Beijing for negotiations again, and again, Beijing will no longer dream of Taipei, or Hawaii, but Los Angeles. If USA will concede the Pacific, Beijing will dream of world domination. Same in Europe, the more Washington tells European allies that it will not back their invocation of NATO article 5 in response to Russian missiles hitting their territory, the more possibilities it opens for Moscow.