 U.S. and South Korea signed a joint nuclear deterrence guideline, a basic yet important step in their efforts to improve their ability to respond to North Korea's evolving nuclear threats. Gregory, you're not a fan of nuclear weapons. This application of nuclear weapons in the conversation in Seoul, South Korea, because North Korea talks about it, does it achieve anything? Where's it going? I don't think they plan to use a weapon. Why are they doing this?