SEOUL (Reuters) - South Korea is considering levying its own sanctions on North Korea as the isolated state ramps up tension with its missile and nuclear provocations, the South s vice foreign minister said on Wednesday, but no decision had been made yet.  Vice Foreign Minister Lim Sung-nam made the remarks at a news conference in Seoul with Deputy U.S. Secretary of State John J. Sullivan and Japanese Vice Foreign Minister Shinsuke Sugiyama.  
Seoul considers unilateral sanctions against North Korea