OPINION: This week’s drone attack on oil facilities in Abu Dhabi marks a key shift in the strategy of the Houthi rebels who had so far limited their attacks to Saudi Arabia.

Despite being a key member of a Saudi-led regional coalition, oil and gas facilities in the United Arab Emirates have largely been spared by the Houthi attacks in the past.

Monday's attack on facilities in the UAE, involving five ballistic missiles and several drones changed this.