The move comes amid growing North Korea-Russia ties after Russian President Vladimir Putin and North Korean leader Kim Jong-un signed a "comprehensive strategic partnership" treaty that would allow North Korea to take action if either side is armed. There has been a call to provide military assistance to each other without any delay. attack.

North Korea's Foreign Ministry said, "The steps taken by the US and its followers to strengthen the military bloc will never be ignored... but will be taken against the state's sovereignty, security and interests and in the region through aggressive and coercive counter-measures." "Peace will be vigorously defended." said a statement carried by the country's official Korean Central News Agency.

The ministry did not specify what it meant by retaliatory measures, Yonhap news agency reported.

On Saturday, South Korea, the US and Japan concluded their first, three-day trilateral multi-domain military drills, codenamed "Freedom's Edge", aimed at strengthening their deterrence against North Korean threats.

The three countries have conducted joint maritime and air exercises before, but Freedom's Edge was the first trilateral exercise conducted across multiple domains, including air, maritime, underwater and cyber.

South Korea's Defense Ministry said the trilateral exercises were "defensive in nature".

"Our military will resolutely respond to any threat or provocation from North Korea that destroys peace and stability on the Korean Peninsula, based on the South Korea-U.S. forceful joint defense posture," the ministry said.