More than two years into a war that has already left 10,000 dead, regional power Saudi Arabia is struggling to pull together an effective local military force to defeat the Iranian-aligned Houthi movement that has seized large parts of Yemen.

The dysfunction is a reminder to Saudi Crown Prince Mohammed bin Salman that his campaign to counter arch-enemy Iran in the Middle East, including threats against Tehran's ally Hezbollah, may be hard to implement.

During a rare visit to a large area of Yemeni territory controlled by the pro-Saudi government, journalists saw a patchwork of mutually suspicious army units, whose loyalty to disparate regions and commanders has hindered their war against Houthi fighters.