The United States is 'very actively' trying to persuade North Korea to come back to negotiations, South Korea's national security adviser said on Sunday, as a year-end North Korean deadline for U.S. flexibility approaches. South Korea was taking North Korea's deadline 'very seriously', the adviser, Chung Eui-yong, told reporters, at a time when efforts to improve inter-Korean relations have stalled. North Korean leader Kim Jong Un in April gave the United States a year-end deadline to show more flexibility, and North Korean officials have warned the United States not to ignore that date.
