The US and China are working on a "range of options" on North Korea, the US top security adviser has said, as tensions mount over the country's nuclear and missile programmes.
Lt Gen HR McMaster told ABC News there was consensus with China that this was a situation that "could not continue".
The comments come after a failed missile test launch by North Korea and a massive military parade.
President Trump had earlier said China was "working with us" on the issue.
Beijing, Pyongyang's biggest ally, has come under pressure from Washington to exert more pressure on its neighbour.
Sunday's comments appear to be the first confirmation that both countries are working together on how to deal with the North Korean issue.
Gen McMaster, who was in the Afghan capital, Kabul, said the latest launch "fits a pattern of provocative and destabilising and threatening behaviour".
"The president has made clear that he will not accept the United States and its allies and partners in the region being under threat from this hostile regime with nuclear weapons," he said.
Military vehicles carry missiles with characters reading Image copyrightREUTERS
North Korea displayed its military capabilities during a huge parade in Pyongyang
"I think there's an international consensus now, including the Chinese and the Chinese leadership, that this is a situation that just can't continue."
President Donald Trump and Chinese President Xi Jinping discussed North Korea during a meeting last week. Mr Xi offered co-operation on "communication and co-ordination", the BBC's Robin Brant in Shanghai reports.
All about North Korea's missile programme
In pictures: Pyongyang parade (with pom-poms)
Earlier on Sunday, South Korean and US military officials said a North Korean missile had detonated soon after launch. The US Pacific Command said it believed it to be a ballistic missile.
Investigations were continuing, but one unnamed US official said it was unlikely to have been an intercontinental (ICBM) missile.
Ballistic missiles follow high trajectories and are initially powered and guided, but fall to their target under gravity. ICBMs follow a sub-orbital trajectory, others stay within the atmosphere.
North Korea's aim is to be able to put a nuclear warhead on an ICBM that can reach targets around the world.