I’m pretty shocked no one in this thread gives credit to China. Kim Jong Un did travel to Beijing in an armored car and met with Xi Jinping. China has also been levying sanctions and restricting tourist travel etc into the country. China is quite annoyed at what Korea is doing to threaten its Belt Road plans. And with the Korean conflict potentially over, China has free reign to dominate Asia, and push up against Japan. No doubt Trump likely pushed things to a head with his Twitter diplomacy but an extremely globally ambitious China has to play a role in this as well.