SKorea holds navy drill; NKorea scraps sea accord (OneNewsNow.com) KELLY OLSEN- Associated Press Writer - 5/27/2010 5:10:00 AM SEOUL, South Korea- Stung by a surprise underwater attack, South Korea flexed its muscles Thursday with anti-submarine drills and a U.S. general offered strong words of support as the allies sent a clear message to adversary North Korea: Don't try it again. Pyongyang, however, wasted little time in responding, saying it would launch "immediate physical strikes" against southern ships that enter its waters as tensions spiked further a week after Seoul blamed the North for torpedoing a warship. Inter-Korean political and economic ties have been steadily deteriorating since the February 2008 inauguration of South Korean President Lee Myung-bak, who vowed a tougher line on the North and its nuclear program. But the sinking of the warship Cheonan and deaths of 46 sailors in March have returned military tensions _ and the prospect of ...