Joint U.S. - South Korea military exercises are underway off the eastern coast of the Korean Peninsula. The USS Ronald Reagan carrier group is participating, the first time a U.S. aircraft carrier has participated in such exercises with South Korea since 2017. North Korea recently tested a the latest of dozens of ballistic missiles it has fired recently. North Korea has been ramping up its rhetoric about its nuclear capabilities in recent years, and recently passed a law allowing it to conduct preemptive nuclear strikes.
"U.S. Carrier, South Korea Ships Launch Drills Amid North's Threat" - VOA
"U.S. Aircraft Carrier Starts Joint Military Drills in South Korea" - Aljazeera