South Korean soldiers ride a military truck during a military drill near the demilitarized zone separating the two Koreas in Paju, about 45 km (28 miles) north of Seoul, June 4, 2009. North Korea, which began ratcheting up regional tensions when it fired a long-ranged rocket over Japan in April, also test-fired a barrage of short-range missiles last week and threatened to attack the South. REUTERS/Kim Kyung-Hoon (SOUTH KOREA POLITICS MILITARY)