China and the United States will work together to try and prevent further missile tests by North Korea, US President Barack Obama says.
In recent weeks, North Korea has carried out a hydrogen bomb test and repeatedly test-fired missiles.
President Obama met Chinese President Xi Jinping on the sidelines of a nuclear summit in Washington on Thursday.
But hours later, South Korea's Yonhap news agency said the North appeared to have test-fired another missile.
The latest test saw what appeared to be a ballistic missile land off the east coast of the Korean peninsula, Yonhap reported.
Obama said he and Jinping were seeking to agree "how we can discourage action like nuclear missile tests that escalate tensions and violate international obligations".