BEIRUT — Hezbollah's ambitions are spreading far beyond its Lebanon home as the militant Shiite movement appears increasingly bent on taking on Sunni foes across the Middle East. It has sent thousands of its fighters into Syria and senior military advisers to Iraq, helped Shiite rebels rise to power in Yemen and threatened Bahrain over its abuse of the Shiite majority. But the regional aspirations also are taking a heavy toll and threatening to undermine Hezbollah's support at home. The group has suffered significant casualties, there is talk of becoming overstretched, and judging by the events of recent days, even a vague sense that the appetite for fighting the Israelis is waning. But that was then. Today, many increasingly look to Sunni-majority powers as their true backers. "Increasingly, Hezbollah's leadership perceives itself as a Shiite Arab regional actor, placing its commitment to the Palestinian cause on par with its mission as a defender of Shiite political and religious rights in the Arab region," said Randa Slim, a director at the Washington-based Middle East Institute. "The consequence for Lebanon is that at some point the Shiite underpinnings of Hezbollah's regional role will clash with the interests and demands of its non-Shiite, mainly Sunni compatriots." Hezbollah has room to grow as a leading defender of Shiites. But when Nasrallah has tried to make aggressive political proclamations, the results sometimes have backfired. On Jan. 9, Nasrallah harshly criticized Bahrain over its crackdown on a Shiite-led uprising and its arrest of a leading Shiite cleric, Ali Salman. He compared Bahrain to his archenemy Israel, saying it was naturalizing foreigners to make the Arabian Gulf island increasingly less Shiite. Nasrallah then issued a veiled threat to Bahrain, although he said protests should remain peaceful. "Weapons can be sent to the most secure countries. Fighters and gunmen can enter and small groups can sabotage a country," he said. Hostile reaction swept the Arab world and Lebanon, where even some Shiites complained that threatening Bahrain could spur oil-rich Gulf nations to expel Lebanese Shiites from their soil. The six-nation Gulf Cooperation Council called Nasrallah's comments "hostile and irresponsible." The 22-nation Arab League accused him of meddling in Bahrain. — AP