The latest war between Israel and Hamas is the biggest conflagration in the Middle East today, but sparks and fires are emerging across the region. Each provides ample opportunity to launch a wider war. The common thread is Iran. This means the key to preventing escalation lies in Iran as well. Iran, a Shia Muslim state, arms, trains and supports a network of militant groups across the region. While most tensions there historically fall along the Sunni-Shia religious divide, Iran’s “ axis of resistance” includes groups on both sides. Right now, Iran is stirring up trouble on a half-dozen front…