North Korea has carried out at least 2 rocket motor tests since April , website says . Comment: Another big rocket launch would further sour North Korea 's relations with the United States and South Korea . A failed rocket launch by the North in April scuppered a food aid deal with the U.S . The academic website sees the possibility of rocket and nuclear tests in 2013 .
North Korea has carried out at least 2 rocket motor tests since April , website says . Comment: A failed rocket launch by the North in April scuppered a food aid deal with the U.S . The academic website sees the possibility of rocket and nuclear tests in 2013 .