Leader Kim Jong-un declared the test "a new birth" for the North's rocket industry, state news agency KCNA said.
The possession of strong nuclear weapons is "the only way" to ultimately put North Korea-U.S. relations in order and "absolute collateral" for peace and security on the Korean Peninsula, the paper said.
U.S. Secretary of State Rex Tillerson told Chinese President Xi Jinping in Beijing on Sunday (March 19) that President Donald Trump looked forward to enhancing bilateral relations and also to the opportunity for a visit in the future.
U.S. President Donald Trump told reporters he held meetings on North Korea at the weekend at his Florida resort.
North Korean dictator Kim Jong-un called the rocket engine test "a great event of historic significance".
"Through this test, it is assessed that (North Korea) has made meaningful progress in engine performance, but further analysis is needed for exact thrust and its possible uses in future", said South Korean Defense Ministry deputy spokesman Lee Jin-woo.
Aussies slip to 4-83 in search of draw
Led brilliantly by Shaun Marsh and Peter Handscomb, Australia has held on for a stunning draw in the third Test against India. The pair shared a 199-run stand as the touring attack failed to take a wicket in either the morning or afternoon sessions.
Yesterday the USA hinted that it would consider a pre-emptive strike on North Korea - as President Trump took aim at the country's despotic regime.
In South Korea, he outlined a tougher strategy to confront North Korea's nuclear threat.
Sunday's test was a "precisely-timed spectacular", said Peter Hayes, director of the US-based Nautilus Institute, "the kind we've come to expect from Kim Jong Un".
In his comments in Seoul, Tillerson laid out details of the USA approach, saying it would focus on getting China to better enforce United Nations sanctions against North Korea.
Able to evade North Korean air defense, 10 B-2s alone, with a total of 13,600-kg GBU-57 deep-penetration warheads and eight 900-kilogram GBU-31 satellite-guided bombs, can destroy or severely damage known nuclear weapons infrastructure in North Korea. He also said a "new approach" is necessary for the North, while emphasizing that conditions for talks with Pyongyang are "not ripe".
Past US administrations have considered military force against North Korea over its development of nuclear weapons and ballistic missiles, but rarely has that option been expressed so explicitly.