U.S. Vice President Mike Pence said Sunday that North Korea’s “provocation” underscored the risks faced by American and South Korean service members, hours after the North conducted a failed missile launch shortly before Pence’s arrival. Pence landed in South Korea at the start of a 10-day trip to Asia and was quickly confronted with the stakes facing the United States as Pyongyang seeks to flex its muscles around the birth anniversary of the country’s late founder and advance the regime’s nuclear and missile capabilities.