The warning came after Seoul and Washington last week signed a new joint strategy to counter the growing threat of a North Korean nuclear attack after the communist country restarted an ageing plutonium reactor.
That accord also drew a sharp rebuke, with analysts attributing the isolated regime's recent bellicose rhetoric to its desire to arouse the United States' attention and draw it back into long-stalled talks.
The naval drill in waters around the Korean peninsula, which is expected to begin today, involves South Korea, Japan and the United States which has deployed the nuclear-powered carrier USS George Washington.
North Korean troops had been ordered to "keep themselves fully ready to promptly launch operations any time", a spokesman for the General Staff of the Korean People's Army said, in a statement carried by the state-run Korean Central News Agency.
North Korea said the situation on the peninsula was "getting strained again" and warned the US that the closer its forces came "the more unpredictable disasters their actions will cause".
"The US will be wholly accountable for the unexpected horrible disaster to be met by its imperialist aggression forces," the statement said.
"The US should bear in mind that the Korean people and army are highly alert to promptly and confidently cope with and foil blatant provocations of any hostile forces in the world with its own powerful military muscle."
A spokesman for the US-South Korea Combined Forces Command hinted that the military drill might have to be postponed due to an approaching typhoon.
"The joint exercises will be conducted this week as planned. But like any other maritime exercises, we will continue to monitor weather conditions and adjust them as necessary", he told AFP.
The spokesman described the exercise as "an annual search and rescue drill and humanitarian in nature".
A US defence official speaking last week in Tokyo called the three-nation drills "increasingly common" and "designed to strengthen coordination and improve readiness to respond to situations such as humanitarian assistance and disaster relief".
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
)