The official Korean Central News Agency said the performers on Monday showed "beautiful and graceful rhythmic movements, high-spirited gymnastics, interesting national emotion and rich artistic depiction", but also that Kim Jong-un was unhappy about their display.
A newspaper in South Korea last week cited an unidentified source who claimed Kim had instructed his sister to lay low following the collapse of his summit with Trump in February over mismatched demands in sanctions relief and nuclear disarmament.
"The U.S. would be well-advised to change its current method of calculation and respond to our request as soon as possible", the official said in the statement.
About reports of a "shakeup" of Kim's negotiating team in a May 5 interview with Australia's ABC News, Pompeo said it did appear that his future counterpart would be somebody else, adding: "But we don't know that for sure".
Moreover, Pyongyang authorities have reportedly executed several officials who were involved in organizing two US-North Korean summits due to the failure of the second one.
An analyst at South Korea's Sejong Institute, Cheong Seong-Chang, said that Kim Yong Chol would not have reappeared in public so quickly if he were sent to re-education or forced labor, according to USA Today.
Kim ordered "important tasks" to be undertaken to make sure North Korea's policies on revolutionary art were correctly implemented, the country's state-run news agency said.
The summit in Hanoi fell apart when Trump said Kim had failed to offer enough nuclear weapons or ballistic missiles in exchange for lifting global sanctions.
Iranians rally to support Palestinians on al-Quds Day
Militia leaders have vast political influence and have been striking a less inflammatory tone over the past few weeks. Iran is fiercely opposed to Israel, which it does not recognize and blames for numerous problems in the Middle East.
The South's Munhwa Ilbo afternoon paper carried the photo on the front page of its Monday edition, with the headline: "Kim Yong Chol, rumoured to be purged, affirms his position next to Kim Jong-un".
Although North Korea has previously banished or executed scapegoats to atone for major political failings, experts doubted the recent reports saying such extreme punishments were unlikely unless Kim Jong Un was abandoning negotiations with the United States.
Choe Ryong-hae, another erstwhile right-hand man of the leader's, was sent to a reeducation camp in November 2015 but reinstated three months later and now holds a ceremonial post. In 2013 she was alleged to have been shot in a "hail of machine gun fire while members of her orchestra looked on".
Last year, Hyon Song-wol swept into Seoul leading a visiting North Korean delegation ahead of the Winter Olympics looking rather glamorous in a fur coat and very much alive.
The last time state media had shown her was at a meeting of the North's rubber-stamp parliament on April 12.
South Korean intelligence officials said in 2016 that the former military chief Ri Yong-gil had been executed for corruption.
Kim Hyok-chol may appear alongside Kim Jong-un at a later date, as well.
Correction: An earlier version of this article incorrectly named the leader of N. Korea as Kim Jong-Il.