FILE - In this Sept. 15, 2016, file photo, North Korean defectors prepare to release balloons carrying leaflets and a banner denouncing North Korean leader Kim Jong Un for North Korea's latest nuclear test, in Paju, near the border with North Korea, South Korea. North Korea often marks significant dates by displaying military capability, and South Korean officials say there's a chance the country will conduct its sixth nuclear test or its maiden test launch of an ICBM around the founding anniver