Japan is never going to voluntarily attack China. Even if there was a desire to, they know they could not win. Any military build up by the former is due to fear of the latter.
These sort of things can work as a deterrent as much as power projection, and they don't have to get into direct violent/physical conflict for there to be diplomatic tension/worsening of relations as a result. I'm not saying this is most effective use of Japan's resources or focus or that China is for sure going to do anything or making any other such claims, just explaining the potential rational for why China would be non-plussed at Japan over F35 purchases even if they don't feel Japan is gunning for them.
Of course, if china has no actual wartime intentions in Japans sphere of influence, then yeah, they probably give much less of a shit. So depends on what their intentions really are as to how they feel about it. The fact that they're publicly broadcasting displeasure is probably not a sign that they're cool with it though.
What has China done new?
* https://en.wikipedia.org/wiki/Tibet
* https://en.wikipedia.org/wiki/Uyghurs
* https://en.wikipedia.org/wiki/Sino-Indian_War https://en.wikipedia.org/wiki/Sino-Indian_border_dispute
* https://en.wikipedia.org/wiki/Sino-Vietnamese_War https://en.wikipedia.org/wiki/Sino-Vietnamese_conflicts_(197...
* https://en.wikipedia.org/wiki/2022_Chinese_military_exercise...
* https://www.channelnewsasia.com/east-asia/philippines-south-...
Also, China does regularly attack other countries' navies around the South China Sea with no legal justification.
Because they ultimately are managing better in the 21st century than any other country. America had its peak from 1945 to 2001. Britain ran the world in the 19th century. China is the new global superpower.
In an ideal world America would have managed to keep a bipolar world going, but it has decided to abandon that in favour of short term boosts.
It does, and I already wrote about western countries being just as guilty of invading, if not more so. None of what you wrote contradicts my point that China is actively expanding and using mainly economic tactics to do it.
Also that attack happened on Sept 18, this very day, in 1931.
It was the western colonial powers & most importantly the USA that they attacked & could not have realistically won against.
That's why fascism doesn't work btw. They end up believing their own lies and do the most egregiously idiotic shit.
Except against Taiwan, Korea, Russia (1905), Manchuria.