In a "might makes right" world, Europe clearly needs more might, and then it makes sense to improve relations with China; not a lot of options.
The EU can't mend ties with China without giving up on Ukraine as China's FM Wang Yi has stated [0] on multiple occasions [1]. Additionally, in the Chinese foreign policy space, the EU is viewed as weak [2], and largely through the lense of the US-China rivalry (which is how the US views the EU as well now).
[0] - https://www.scmp.com/news/china/diplomacy/article/3316875/ch...
[1] - https://www.reuters.com/world/china/china-russia-discuss-ukr...
[2] - https://fddi.fudan.edu.cn/_t2515/57/f8/c21257a743416/page.ht...
Literally every single one of Europe's prized industries are in the crosshairs of China's industrial ambitions.
The US and France are both nuclear armed, including nuclear armed submarines, which are the ultimate defence deterrent.
It's hard to see any country wanting to get into conventional war with China, regardless of size of army and airforce - even the US is not going to do it unless actually attacked. At the end of the day if China seizes Taiwan (something Trump has made more likely by his seizing of Venezuala, now talking about Greenland, Cuba ..), then the US will just complain, create trade sanctions and/or tarrifs etc.