The United States is negotiating with China on a possible stronger UN Security Council response - such as sanctions - to North Korea's repeated ballistic missile launches, which the 15-member body normally condemns in a statement, diplomats say.
It was not immediately clear how open Beijing might be to new sanctions. The council has traditionally boosted sanctions in response to North Korea's five nuclear tests and two long-range rocket launches.
Sanctions were first imposed on Pyongyang in 2006.
The most recent test, which failed, came on Friday following a UN Security Council meeting on North Korea, chaired by US Secretary of State Rex Tillerson.
"The cumulative actions of the DPRK (North Korea) since their last nuclear test compel us to look at a range of measures that would apply pressure," said a spokesman for the US Permanent Mission to the United Nations on Tuesday.
"As Secretary Tillerson said on Friday, business as usual is not an option. We are exploring options for a response to this series of provocations with our Security Council colleagues," the spokesman said.
The Trump administration has been aggressively pressing Beijing to rein in its ally and neighbour North Korea, warning that all options were on the table if Pyongyang persists with its nuclear and missile development.
But China has said military threats would not help the situation and has accused the United States of fuelling tensions on the Korean Peninsula.
The last round of complex sanctions imposed by the Security Council took three months to negotiate following Pyongyang's fifth nuclear test in September. Those measures aimed to cut North Korea's annual export revenue by a quarter.
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