South Korean lawmakers say intelligence officials briefed them on the North's tough pandemic rules, including a Pyongyang lockdown and an execution of an official caught breaking restrictions.
Pyongyang says an unidentified man was found in North Korean waters and that he murmured he was from South Korea but then stopped responding to soldiers' questions and appeared to try to flee.
Her political star has risen since Kim Jong Un took power in 2011, leading to speculation that she could one day become the country's first female leader — if North Korea's patriarchy would allow it.
The move is the latest sign of deterioration in relations between North and South Korea. On Tuesday, North Korean officials did not answer a routine daily call from the South.
The North Korean leader's public absence and reports of a recent surgery have prompted a flurry of rumors about his health. But South Korean officials said Tuesday, "There is nothing we can confirm."
He stopped short of saying he was breaking off nuclear negotiations with the U.S. President Trump has repeatedly touted the testing moratorium as a political victory.
North Korea has threatened to send a "Christmas present" for the United States if sanctions aren't eased by the end of the year. Trump says he isn't worried about it.
In an exclusive interview with NPR, former Ambassador John Bolton criticized his ex-boss' strategy, saying "there's no serious chance" North Korea will voluntarily give up its nuclear weapons program.