China and Taiwan have been on the map for ages https://en.wikipedia.org/wiki/Davidson_window
The concept gained widespread attention following CIA Director William J. Burns' 2023 statement that, according to U.S. intelligence, General Secretary of the Chinese Communist Party Xi Jinping had instructed the People's Liberation Army to be ready for a Taiwan invasion by 2027.[2]
Europe has been at war with Russia since 2022
what do you call that if not a world at war?
You're right, it'd be a world at war but I wouldn't classify it as a 'world war' unless China plans on invading Europe or America or is it just over the island themselves?
I think it'd involve more than a big war over Taiwan or Ukraine, these would just be big proxy wars