President Trump announced early Tuesday morning that the U.S. would be ending "war games" (joint military exercises) with South Korea, a significant concession to North Korea that does not appear to have been made in consultation with Seoul.

How it's playing: South Korea is reportedly seeking more information about what Trump meant. Bill Neely, NBC News' Chief Global Correspondent, tweets: "There is every indication from Seoul that the South Korean leadership and military did not know the US was about to cancel Joint Military exercises. 'We need to find out' they say. Stunning if true."

The rhetoric that accompanied the announcement was significant as well.