New missiles cannot travel about 100 kilometers . Weapons cannot reach Japan or the bases on Guam . U.S. Secretary of State Hillary Clinton , who returned from Asia on Sunday after her first overseas trip in the post , recently called North Korea 's nuclear program `` the most acute challenge to stability in northeast Asia . '' Tensions on Korean peninsula running high .
New missiles cannot travel about 100 kilometers . Weapons cannot reach Japan or the bases on Guam . Tensions on Korean peninsula running high .