If we add up "damage to countries around it" in the previous hundred years, I think Japan doesn't look so great.
China conducted one several-week war against Vietnam and annexed Tibet, both over 50 years ago. Other than the longstanding dispute with Taiwan, who are they threatening? Some quibbles over a few Himalayan mountains with India?
They seem quite intent on inching their border closer to the Philippines mainland by building military bases on some shoals that belong to the Philippines.
One War. In 1962, i.e. 64 years ago. In meanwhile, US supported genocidal regime of Pakistan killing Hindus and many more in what is now Bangladesh. Sent billions more to Pakistan which are then used to fund terrorist activities in India. and some more recently under Covfefe.
"The Defence Ministry of India reported: 88 killed and 163 wounded on the Indian side, while 340 killed and 450 wounded on the Chinese side, during the two incidents.[6][7]
According to Chinese claims, the number of soldiers killed was 32 on the Chinese side and 65 on the Indian side in Nathu La incident; and 36 Indian soldiers and an 'unknown' number of Chinese were killed in the Cho La incident.[8] "
War might be overstating it a bit, "incident" might be more appropriate, but we can round up in the spirit of comity.
So adding it all up, the Chinese had 1-2 small foreign wars per decade in the 50s-70s, zero since 1979. It still doesn't justify the phrasing "threatening all their neighbors" in 2025, aside from Taiwan specifically.
In the case of the line of control with India, it's reached the point where they're having ritualized fistfights at high altitude for pride, that's just comical. It's not threatening.
China conducted one several-week war against Vietnam and annexed Tibet, both over 50 years ago. Other than the longstanding dispute with Taiwan, who are they threatening? Some quibbles over a few Himalayan mountains with India?