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>> eventually he will have to test if he wants to advance further the program itself. on the other hand, kim jong-un fully understands that to test long-range missiles is essentially a big red line that the biden administration may not take very well. >> reporter: this comes as intelligence analysts from seoul to washington are keeping close watch on kims appearance, specifically his weight. side by side video comparisons indicate kim appears much thinner now than he was last year. last fall, so...