Eight months after launching a war in Yemen, Saudi Arabia appears trapped in a protracted and devastating conflict that is straining relations with its allies, intensifying internal power struggles and emboldening its regional rival, Iran, analysts say. Since March, the key U.S. ally has led a coalition of mostly Gulf Arab countries and Yemeni fighters in a military campaign to drive out Iranian-aligned rebels who seized the capital, Sanaa, and swaths of the Arabian Peninsula country. But the coalition appears increasingly hobbled by divisions and unable to find a face-saving way to end the costly conflict. The rebels, known as Houthis, still control much of Yemen’s north. And in southern areas where the coalition has driven them out, lawlessness has spread as attacks […]