The High Representative of European Union for Foreign Affairs and Security Policy and Vice President of the European Commission Federica Mogherini warned of the consequences of launching a ballistic missile by Houthi militias on the city of Riyadh on Tuesday. She said in a statement issued today that this constitutes an unacceptable violation of the international law and a further dangerous escalation of the conflict which reduces the prospects of a negotiated solution to the war in Yemen.