KYIV, Ukraine — American and South Korean officials said Wednesday that there’s evidence North Korea has dispatched troops to Russia in a potential escalation of the nearly 3-year-old war with Ukraine . If the soldiers' goal is fighting with Russia in Ukraine, it would be the first time a third country puts boots on the ground in the war. Other countries on both sides of the divide have sent military aid, including weapons and training: Iran has supplied Russia with drones , and Western nations