Kim Jong Un has made his first public appearance in 20 days amid speculation about his health.
The North Korean leader cut the ribbon at the opening of a fertiliser factory in Sunchon at a ceremony with other senior officials.
These included his sister Kim Yo Jong, who many analysts predict would take over if her brother is suddenly unable to rule.
State media said workers at the factory broke into “thunderous cheers” for Mr Kim, who it said is guiding the nation in a struggle to build a self-reliant economy in the face of “head wind” by “hostile forces”.
Speculation about his health ramped up after he missed the April 15 birthday celebration for his late grandfather Kim Il Sung, the country’s most important holiday, for the first time since taking power in 2011.
The possibility of high-level instability raised troubling questions about the future of the secretive, nuclear-armed state that has been steadily building an arsenal meant to threaten the US mainland while diplomacy between Mr Kim and US President Donald Trump has stalled.
Speaking to reporters at the White House, Mr Trump declined to comment about Mr Kim’s reappearance but said he would “have something to say about it at the appropriate time”.
South Korea’s government, which has a mixed record of tracking Pyongyang’s ruling elite, repeatedly downplayed speculation that Mr Kim, believed to be 36, was in poor health following surgery.
It was not immediately clear what caused Kim’s absence in recent weeks.
In 2014, Kim vanished from the public eye for nearly six weeks and then reappeared with a cane. South Korea’s spy agency said he had a cyst removed from his ankle.