Russia's secret plans targeted Japan and South Korea
Beijing has yet to announce the closing ceremony for its "Year of Friendship" with Pyongyang, a possible signal of disapproval.
South Korea's military has said that North Korea is preparing to continue aiding Russia in its war with Ukraine, despite casualties.
Russia and Japan have never signed an official peace treaty to end the second world war because of a dispute over the Kuril Islands. The Soviet army seized the Kurils at the end of the war in 1945 and expelled Japanese residents from the islands, which are now home to about 20,000 Russians.
South Korea's military said on Monday it has detected signs of North Korea preparing to send more troops and weapons, including suicide drones, to Russia to support its war against Ukraine.
North Korean leader Kim Jong Un pledged to solidify the country's comprehensive strategic partnership with Russia in his letter to President Vladimir Putin on Monday, state media KCNA reported on Tuesday.
"Through various sources of information and intelligence, we assess that North Korean troops who have recently engaged in combat with Ukrainian forces have suffered around 1,100 casualties," the JCS said in a statement.
North Korea's Kim Jong Un vowed to implement the "toughest" anti-U.S. policy, less than a month before Donald Trump takes office as U.S. president.
North Korean leader Kim Jong Un says he will implement the “toughest” anti-U.S. policy, less than a month before Donald Trump takes office as U.S. president
Secret Russian military documents detail target lists and preparations for potential conflicts with Japan and South Korea.
Ukrainian special forces have released several excerpts from a purported diary it said was found on a North Korean soldier killed in front-line fighting in Russia.
A South Korean court authorized a warrant Tuesday for the arrest of suspended President Yoon Suk Yeol on insurrection allegations following a short-lived bid to impose martial law at the start of the month.