BEIRUT (Reuters) - The leader of Lebanese guerrilla movement Hezbollah said on Saturday his group would stay in the Syrian war "to the end of the road" and bring victory to its ally President Bashar al-Assad. Hassan Nasrallah, head of the militant Shi'ite Muslim group, said in a televised speech that Syria and Lebanon were facing a threat from radical Sunni Islamists, which he argued was a plot devised by the United States and its allies to serve Israel's interests in the region. "We will not rely on anyone ... ...