You support Taiwan, not just with weapons, but also with shooting at China's invasion force. China of course shoots back. One side or the other loses that encounter and decides to escalate rather than backing down. If that continues, yes, you and China can jointly start WW3.
So you are saying China started WW3 by attacking Taiwan?
How do you think WW1 and WW2 started?
So China is the Austro-Hungarian Empire in this scenario, initiating WWI or Axis Powers NAZI Germany and imperial Japan?