A fresh storm may be brewing for U.S. President Joe Biden as he grapples with a number of foreign policy challenges, with this one arriving on the Korean Peninsula.
Nuclear-armed North Korea appears to have restarted the plutonium-producing reactor at its Yongbyon nuclear site, the U.N. atomic agency has said, calling the development "deeply troubling."
The apparent restart last month — which would be the first time in nearly three years that the 5-megawatt reactor has been operational — could help North Korean leader Kim Jong Un add to his growing stockpile of fissile material.
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