North Korea has test-fired a medium-range ballistic missile that appeared like KN-15 from its eastern port of Sinpo into the Sea of Japan.
South Korea's defence ministry said the missile flew about 60km (40 miles), various media reported today.
The missile launch is the latest in a series of tests which the North has been conducting in pursuit of its aim to develop a nuclear missile.
The launch comes on the eve of a visit by China's President Xi Jinping to the US to meet President Donald Trump. The two will discuss how to rein in North Korea's nuclear and missile programmes as the US steps up the pressure on China, a historic ally of Pyongyang, to help more on the issue.
Washington was ready to act without Beijing's co-operation “If China is not going to solve North Korea, we will." Trumph said.
The North is banned from any missile or nuclear tests by the UN, though it has repeatedly broken those sanctions. China has long been North Korea's closest diplomatic ally and trading partner, but the relationship has become strained over Pyongyang's refusal to halt nuclear and missile testing.
There are fears that Pyongyang could eventually develop the ability to launch long-range nuclear missiles capable of striking the mainland US.
"China has great influence over North Korea. And China will either decide to help us with North Korea, or they won't. And if they do that will be very good for China, and if they don't it won't be good for anyone." Mr Trump added.