North Korean leader Kim Jong Un observes the firing of suspected missiles in this image released by North Korea's Korean Central News Agency (KCNA) on Mar 22, 2020. (Photo: KCNA/via REUTERS/File photo)

SEOUL: North Korean leader Kim Jong Un is receiving treatment after undergoing a cardiovascular procedure early this month, a South Korean media report said, amid speculation over Kim's health following his absence from a key anniversary event.

North Korea marked the anniversary of the birthday of its founding father and Kim's grandfather, Kim Il Sung, as a national holiday on Apr 15, but Kim was not seen in attendance.