On Thursday, Iranian President Hassan Rouhani condemned the Saudi-led military intervention saying it is “very dangerous and deepens the crisis."
Without participating in the offensive, the United States is backing its Arab allies and has agreed to provide logistical and intelligence support for the military operation.
Aid by the United States to the Yemeni military for operations against al-Qaeda was described by US President Barack Obama in September 2014 as a successful example of US counter-terrorism efforts.
The Shiite Houthi militants forced President Hadi and his government to resign in late January 2015 after taking over the capital in September 2014. The group then dissolved Yemen's parliament and announced the forming of a Presidential Council. Hadi, who was placed under house-arrest in Sanaa, fled to the port city of Aden in February, and disavowed his resignation.