The U.S. nuclear-powered submarine MI approaches a naval base in Busan, South Korea.
Joint military exercises are particularly infuriating to Pyongyang.
The KCNA report listed a string of perceived United States provocations - including a litany of bombastic threats from President Trump, recent deployments of a U.S. nuclear submarine and aircraft carrier to the region, and a new round of "high intensity" USA and South Korea joint naval drills.
A nuclear-powered attack submarine also made a high-profile visit to a South Korean port.
"We have already warned several times that we will take counteractions for self-defence, including a salvo of missiles into waters near the USA territory of Guam", Mr Kim, the researcher, told the North's official Korean Central News Agency.
It is unlikely to have any effect on next week's planned major joint-navy drill between Sourth Korea and the U.S.
North Korea has launched two missiles over Japan and conducted its sixth nuclear test in recent weeks as it advances quickly toward its goal of developing a nuclear-tipped missile capable of hitting the USA mainland.
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As the US continued to display its military might on the Korean Peninsula, on Friday, North Korea unleashed another threat against the U.S.
The US territory is in the crosshairs this time over a joint naval exercise being held by the US and South Korea and scheduled to start Monday in the waters around South Korea.
Kim Jong-un's regime hit back today saying the war drill "hardened our determination that the USA should be tamed with fire".
'Let's hope that diplomacy works, ' he said.
On Tuesday Trump discussed "a range of options" with his national security team to respond to North Korea's recent missile and nuclear tests.
Today's fresh threat was published in North Korean state media, according to CNN's Will Ripley who shared the statement on Twitter. Across both party lines, Americans say negotiating with the country is a "waste of time".