GOING NUCLEAR North Korea nuke fears as ‘heightened activity’ seen at nuclear site weeks after Kim Jong-un’s ballistic missile tests Jacob Bentley-York Updated: 8 Apr 2021, 13:46 FEARS over a war with North Korea continue to escalate after “heightened activity” was detected at the state’s main testing site. New satellite images showing their continued campaign of construction has led experts to believe that the secretive state is now ramping up their nuclear program. 4 4 It comes after Kim Jon-un launched two ballistic missile tests to intimidate BidenCredit: AFP The news comes merely weeks after Kim Jong-un deployed two ballistic missile tests into the Sea of Japan, in what was branded a "show of strength" to intimidate US President Joe Biden.