How significant is Xi Jinping's visit to North Korea?

Chinese President Xi Jinping is in North Korea, aiming to reinforce Beijing's leverage with Pyongyang. North Korea, isolated and under UN sanctions, insists on being recognized as a nuclear state, calling its program a 'line of no retreat'. Xi's visit comes after summits with Donald Trump and Vladimir Putin, the latter developing closer ties with Kim Jong Un. The program analyzes regional geopolitical implications with experts.