China's President Xi Jinping is in North Korea for a meeting with Kim Jong-un, in the first Chinese state visit to the North since 2005, BBC reports.
The two, who have met in China four times, are expected to discuss the stalled talks over the North's nuclear programme as well as economic issues.
China is hugely important to North Korea, as its main trading partner.
Mr Xi's visit comes a week before the G20 summit in Japan, where he is set to meet US President Donald Trump.