the united states is exploring new diplomatic, security and economic options against the escalating threat posed by north korea's nuclear and ballistic missile programmes, the white house said today. `the us, in coordination with our allies, is exploring a new range of diplomatic, security, and economic measures in response to the grave and escalating threat posed by north korea’s nuclear and ballistic missile programs,` white house press secretary sean spicer told reporters.the white house statement in this regard comes days after secretary of state rex tillerson said that the us is running out of its strategic patience against north korea, which has been indulging in a series of provocative behaviours including missile tests in alleged violation of the un resolutions. congressman ed royce, chairman of house foreign affairs committee, has introduced a bipartisan legislation in house of representatives to tighten us sanctions against north korea.korean interdiction and modernisation of sanctions act, h.r.1644 expands sanctions to deter north korea's nuclear weapons programs; and targets those overseas who employ north korean slave labor, a source of billions of dollars in annual revenue for the regime. it also cracks down on north korean shipping and use of international ports, and; requires the administration to determine whether north korea is a state sponsor of terrori...