China was at that moment the whipping boy of the world. A big "Chance" waiting for the bold "white" man. Never mind the "Japs", they are our "pets".
(Sorry very snarky)
Respecting neutral territory was a yes/no thing - if the Entente would invade China, then the Entente would invade anywhere it felt it must. If so, Moltke was right about Belgium.
And Greece was bullied by bot sides. In the end the Entente used force first. And invaded. But never doubt the big bad Hun would have done the same, just read the report that my propaganda.
Not to get too diverted from the topic, but the curious thing about the Central Powers was that they had clear shots at pre-emptive invasions of both Greece and Rumania after the fall of Serbia, but elected in both cases to await their aggression.