AKIPRESS.COM - North Korea's latest rocket-engine test showed "meaningful" progress, South Korea said on Monday, while an analyst said it was a dangerous step towards the North's goal of developing a rocket that could hit the United States, reports Reuters.

The North's KCNA news agency said on Sunday the engine would help North Korea achieve world-class satellite-launch capability, indicating a new type of rocket engine for an intercontinental ballistic missile.

The North's announcement of a successful engine test came as U.S. Secretary of State Rex Tillerson was in Beijing at the end of his first visit to Asia for talks dominated by concern about North Korea's nuclear and missile programmes.

"Through this test, it is found that engine function has made meaningful progress but further analysis is needed for exact thrust and possible uses," Lee Jin-woo, deputy spokesman for the South Korean defence ministry, told a regular briefing.

State-run North Korean media reported that leader Kim Jong Un had hailed the successful test of a new high-thrust engine at its rocket launch station as "a new birth" of its rocket industry.

Lee said the test featured a main engine supported by four supplementary engines.

However, he did not elaborate on the progress the test showed the North had made, nor comment on whether the engine could be used for an intercontinental ballistic missile (ICBM), saying the South Korean military was conducting analysis.

U.S. President Donald Trump told reporters he held meetings on North Korea at the weekend at his Florida resort. While he did not refer specifically to the rocket-engine test, he said Kim Jong Un was "acting very, very badly".