The US says it will not call for a UN Security Council meeting over North Korea’s missile tests because it would produce “nothing of consequence”.
Such a meeting would send a message to North Korea that the international community was unwilling to challenge it, US Ambassador Nikki Haley said.
Pyongyang said its tests proved that the entire US was within range.
The US has responded by testing an anti-missile system and flying bombers over the Korean peninsula.
Ms Haley said in a statement that North Korea was already subject to numerous security council resolutions that they “flout with impunity”.
“An additional Security Council resolution that does not significantly increase the international pressure on North Korea is of no value,” she said.
“In fact it is worse than nothing because it sends the message to the North Korean dictator that the international community is unwilling to seriously challenge him.”
She urged China to rein in North Korea.
“China must decide whether it is finally willing to take this vital step. The time for talk is over,” she added.
On Friday, North Korea test-fired a second intercontinental ballistic missile (ICBM).
The launch came three weeks after the state’s first ICBM test.
Responding, the US military said a projectile fired by the US Air Force had been intercepted over the Pacific by a Terminal High Altitude Area Defense (Thaad) unit in Alaska.