Kim Jong Un

China's foreign ministry did not immediately respond to a request for comment

Kim has undergone a cardiovascular procedure earlier this month triggered by heavy smoking, obesity and fatigue

Isolated state has carried out four such firings this month

Moon's appeal came after Kim threatened a demonstration of a new strategic weapon

Both countries are technically at war and the state of truce could turn into an 'all-out armed conflict' any moment

Seoul set to host US President

S Korean newspaper says Kim Hyok Chol, four others, executed by firing squad for 'betraying supreme leader'

Second missile test signals it is serious about developing new, short-range weapons to be used in war with S Korea, US

Kim accuses Washington of acting in 'bad faith'; gives it until the end of the year to change approach

Kim Jong Un oversees tests days before US special envoy visits Tokyo, Seoul for talks on Pyongyang's nuclear arsenal