President Donald Trump took a conciliatory tone when meeting President Xi Jinping on Saturday, but he has claimed China is not doing enough to rein in North Korea's military programs.
That feeling has become acute now Pyongyang has launched a ballistic missile that could hit the US West Coast.
Asked about calls from the United States and others for Beijing to put more pressure on North Korea, Foreign Ministry spokesman Geng Shuang said yesterday it is not China ratcheting up tension.
"Certain people talking about the Korean peninsula nuclear issue have been exaggerating and giving prominence to the so-called China responsibility theory," he said. "This either shows lack of a full, correct knowledge of the issue or there are ulterior motives."
He added: "Asking others to do work but doing nothing is not okay. Being stabbed in the back is really not okay."
China also blames the United States and South Korea for worsening tensions with military exercises.