The South provoked shelling by holding a military drill , the North says . South Korea holds the exercises every year off the Koreas ' shared coast . The South said it was on high alert , but was calmly considering its actions . Comment: The U.S. and South Korea plan a joint military drill starting Sunday .
The South provoked shelling by holding a military drill , the North says . South Korea holds the exercises every year off the Koreas ' shared coast . Comment: The U.S. and South Korea plan a joint military drill starting Sunday .