It marks the fourth known rocket test by Pyongyang this month . The rockets have an effective range of 100 miles , official says . The United States and South Korea criticize the tests as unnecessary . South Korea has said such tests are appropriate compared to U.S.-South Korean military exercises .
The rockets have an effective range of 100 miles , official says . The United States and South Korea criticize the tests as unnecessary . South Korea has said such tests are appropriate compared to U.S.-South Korean military exercises .