China's final warning
The Boy Who Cried Wolf
– Aesop's fable
Crossing the Rubicon
– Idiom to mean a point of no return
Hurting the feelings of the Chinese people
– Chinese political slogan
Paper tiger
– Chinese phrase for an ineffectual threat
Point of no return
– Point beyond which turning back is no longer possible
Red line
(phrase) – Figurative phrase meaning a limit
Red lines in the Russo-Ukrainian War
– Veiled threats of engagement
ultimatum
– Final demand backed up by a threat
China's final warning - Wikipedia