washington frustrate u.s. lawmakers call tuesday high-powered response north korea nuclear test say washington act alone necessary stiffen sanction company china russia country business pyongyang believe response unite state ally supercharge say representative ed royce chairman house representatives foreign affairs committee need use every ounce leverage ... put maximum pressure rogue regime republican congressman tell hear north korea time run u.n. security council step sanction monday follow pyongyang sixth nuclear test sept. impose ban textile export cap oil import ninth sanction resolution unanimously adopt council since 2006 north korea ballistic missile nuclear program win chinese russian support washington drop demand include bid oil embargo hear u.s. officials release american intelligence find north korea smuggle coal commodities russia china assistant treasury secretary marshall billingslea display slide show ship say pick coal commodities north korea illegally turn electronic identification systems hide fact carry cargo china russia pyongyang falsify identity vessels make hard governments determine ship dock port link north korea billingslea say aug. u.n. resolution ban north korean export coal russia china say respect u.n. sanction committee members express frustration previous sanction deter pyongyang play kims years republican representative ted poe say refer north korean leader kim jong un predecessors lawmakers press billingslea act assistant secretary state susan thornton evidence new sanction would effective acknowledge sufficient evidence past sanction work insist administration would work good result time designate chinese bank company unilaterally give choice business north korea unite state say royce breakfast tuesday secretary state rex tillerson go bank company countries business north korea way say u.s. lawmakers want 'supercharged response north korea nuclear test