At recent North Korean ruling party congress, Kim Jong-un reinforced his policy of developing strong nuclear program alongside the economy.
However, there is little data available on North Korean nuclear capabilities as North Korea expelled nuclear inspectors in 2009.
In that case, satellite imagery is the only way to monitor North Korean nuclear facilities. According to the latest news, it seems that Yongbyon Nuclear Complex is again fully operational.
Here, Spaceknow brings you high-resolution satellite imagery of Yongbyon Nuclear Complex between 2010 and 2014 when major structural changes occurred at the plant.