North Korea's main nuclear site as Kim Jong-un admitted the country is facing is facing its "worst-ever situation". Satellite imagery showing increased activity at the hub has led experts to speculate whether the reclusive state is ramping up its nuclear programme.
A coal-fired steam plant had been seen in operation at North Korea's Youngbyon Nuclear Science and Weapons Research Centre, about 100km of the country's capital Pyongyang.
The country has also fired weapons in recent weeks in an apparent show of strength to new US president Joe Biden, and now the satellite imagery suggests the "heightened activity" is continuing.
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