South Korean President Yoon Suk Yeol held his first telephone call with Japan's new Prime Minister Shigeru Ishiba on Wednesday and agreed a united response together with the United States is needed to counter North Korea's threats,

North Korea has been quiet on South Korea since August, prompting analysts to suspect that the “unusual” silence could be linked to its plan to amend the country’s constitution to ensure that Seoul is seen as the “primary foe,