North And South Korea Fired Artillery Shells Into Each Other's Waters On Monday, Forcing People On Five South Korean Islands On The Frontline To Evacuate Their Homes. Early On Monday, North Korea Announced That It Would Conduct Live-Fire Drills In Seven Areas North Of The Yellow Sea Boundary Bettween The Nations. South Korea Responded By Returning Fire After North Korean Shells Landed In Its Territorial Waters .... The Ssang Yong Amphibious Exercise Involves More Than 1,000 South Korean And Nearly 10,000 US Marine And Navy Personnel. Malcolm Cook, Senior Analyst At The Singapore-Based Institute For Southeast Asian Studies, Told VOA's Victor Beattie Today's Artillery Exchange Is Serious, But Not As The 2010 Incidents Involving The March 2010 Sinking Of The South Korean Vessel Cheonan With The Loss Of 46 South Korean Sailors, And The November 2010 Shelling Of Yeonpyeong Island, In Which Four South Koreas Were Killed.