Analysis - New Saudi-Iran crisis threatens wider escalation

By Angus McDowall RIYADH (Reuters) - The last time Saudi Arabia broke off ties with Iran, after its embassy in Tehran was stormed by protesters in 1988, it took a swing in the regional power balance in the form of Saddam Hussein's 1990 invasion of Kuwait to heal the rift. It is hard to see how any lesser development could resolve the region's most bitter rivalry, which has underpinned wars and political tussles across the Middle East as Riyadh and Tehran backed opposing sides. Riyadh's expulsion