The United States is concerned by Russia's growing relationship with North Korea and by what technology the two countries may be exchanging, the top U.S. arms control official said on Wednesday.

Japan's top national security official said he conveyed "serious concerns" to  China's foreign minister over North Korea's deepening ties with Russia after the pair held talks in Beijing.Relations between Japan and China have worsened as Beijing builds up its military capacity in the region,

North Korean leaders have often shown their displeasure with other countries' actions by launching short-range missiles.

With his troops poised for a major offensive in Russia, North Korean leader Kim Jong-un has much to gain and little to lose for the blood price his soldiers look likely to pay on the front lines against Ukraine,

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The treaty underscores a strengthening of military ties between Pyongyang and Moscow while geopolitical tensions rise.