U.S. intelligence warns of possible North Korean nuclear or missile test during or after President Joe Biden's trip to South Korea and Japan starting this week, U.S. national security adviser Jake Sullivan said. #JoeBiden #NorthKorea #Nuclear #Missile #SouthKorea #Japan #News #Reuters Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: http://reuters.com/ Follow Reuters on Facebook: https://www.facebook.com/Reuters Follow Reuters on Twitter: https://twitter.com/Reuters Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en