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Donald Trump has accused North Korea of "disrespecting the wishes of China" following its latest ballistic missile test.
China is the North's main trading partner and the US president has been urging Beijing to try to rein in the reclusive state's military activities.
South Korea said Kim Jong-Un's regime had fired the rocket from around Pukchang, which is near the North's capital Pyongyang.
Seoul and Washington said it had apparently failed shortly after its launch.
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It is believed to have reached a height of 44 miles, and was the third unsuccessful test in recent weeks.
The US leader wrote on Twitter: "North Korea disrespected the wishes of China & its highly respected President when it launched, though unsuccessfully, a missile today. Bad!"
Mr Trump has warned there is a chance of a
"major, major conflict" with North Korea due to rising tensions over its nuclear ambitions and missile tests.
North Korea disrespected the wishes of China & its highly respected President when it launched, though unsuccessfully, a missile today. Bad!
12:26 AM - 29 Apr 2017
Donald J. Trump
The US president said he would "love to solve things (the North Korean problem) diplomatically but it's very difficult".
And at the UN meeting in New York US secretary of state Rex Tillerson urged the Security Council to put economic and diplomatic pressure on Pyongyang .
He said it was only a "matter of time" before the communist state was capable of hitting mainland America with a nuclear weapon.
Speaking after the meeting, North Korea's deputy ambassador to the UN said the country's nuclear weapons would never be part of "political bargains and economic deals".
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He added that the nuclear programme "is the product of the United States' hostile policy towards DPRK".
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