North and South Korea Saturday struck different notes as they marked the first anniversary of a summit between their leaders that fuelled a whirlwind of diplomacy which has died down amid a deadlock over Pyongyang's denuclearisation.Kim Jong-un and President Moon Jae-in held their first meeting on 27 April last year in the Demilitarised Zone (DMZ) dividing the peninsula amid a rapid diplomatic thaw, paving the way for a historic summit between Kim and United States (US) President Donald