beijing white house wednesday condemn missile attack yemen houthi militias saudi arabia say threaten region security undermine efforts halt conflict saudi arabia say air defense force intercept ballistic missile fire war yemen capital riyadh saturday rocket bring near king khaled airport northern outskirts capital saudi arabia crown prince mohammed bin salman say iran supply rocket militias yemen act direct military aggression could act war houthi missile attack saudi arabia enable iran islamic revolutionary guard corps threaten regional security undermine un efforts negotiate end conflict white house say statement u.s. president donald trump begin visit chinese capital missile systems present yemen conflict call upon unite nations conduct thorough examination evidence iranian regime perpetuate war yemen advance regional ambition statement add say unite state would continue work like-minded partner respond attack expose call iran destabilize activities region iran deny behind missile launch wednesday iranian president hassan rouhani say missile attack yemen reaction call saudi aggression reaction missile saudi-led coalition close air land sea port impoverish country also intensify air strike areas control houthis include capital sanaa war kill 10,000 people trigger one bad man-made humanitarian disasters recent history unite nations tuesday call coalition re-open aid lifeline yemen say food medicine import vital million people face famine white house condemn missile attack saudi yemen 's houthis