What options left for US in the midst of North Korea Second successful testing of continental ballistic missile?

Summary: What options left for US in the midst of North Korea Second successful testing of continental ballistic missile? (北韓再成功試射洲際導彈，震驚全球，美國擺出劍拔弩張的架勢，但美國在壓制北韓發展核武計劃上，還有什麽籌碼在手？宋慶勤會同大家報導個中的情形。  )