National security spokesman John Kirby says the U.S. believes that at least 3,000 North Korean soldiers traveled by ship to Russia in early to mid-October. Russia and North Korea have denied the troop movements but have boosted their cooperation.
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The U.S. says 3,000 North Korean troops deployed to Russia and are training at several locations, calling the move very serious and warning that they will be "fair game" if they fight in Ukraine.
