China hit back on Tuesday in unusually strong terms at repeated calls from the United States to put more pressure on North Korea, urging a halt to what it called the "China responsibility theory", and saying all parties needed to pull their weight.
U.S President Trump took a more conciliatory tone at a meeting with Chinese President Xi Jinping on Saturday, but he has expressed some impatience that China, with its close economic and diplomatic ties to Pyongyang, is not doing enough to rein in North Korea.
That feeling has become particularly acute since Pyongyang launched an intercontinental ballistic missile that some experts believe could have the range to reach Alaska, and parts of the U.S. West Coast.
