North Korea has conducted a ground test of a heavy-lift, solid-fuel rocket engine and its separation, Chinese media report.

The test was monitored by North Korean leader Kim Jong Un, the Xinhua news agency said on Thursday, citing North Korea’s Central News Agency (KCNA).

According to Kim Jong Un, the successful test will help boost the power of North Korea’s ballistic missiles.

Last week, Kim Jong Un instructed the country’s military to prepare for conducting new nuclear and missile tests to protect the country against the alleged threat from the United States, despite UN Security Council sanctions.

The leaders of the United States, Japan and South Korea are planning to meet in Washington on March 31 to enhance trilateral cooperation in the face of North Korea's recent nuclear and missile tests.

Pyongyang has conducted a range of missile tests in the past few weeks, amid new sanctions introduced against North Korea by the UN Security Council (UNSC).

The sanctions came in response to Pyongyang’s January hydrogen bomb test, as well as the launch, a month later, of a long-range rocket to allegedly place a satellite into orbit, in defiance of UNSC resolutions.

On March 2, the UNSC adopted a resolution which aimed to affect multiple sectors of North Korea's economy, make all cargo going to and from the country subject to inspection and limit or prohibit the nation's export of coal, iron, gold, titanium and rare natural minerals. The resolution also bans conventional arms sales as well as the delivery of aviation and rocket fuel to Pyongyang.

The United States imposed new sanctions on North Korea on March 16.