Lebanon held on Sunday its first parliamentary elections in nine years, as citizens expressed cautious optimism that the country's rigid, oft-deadlocked sectarian political system could be swayed. Behind the scenes, however, one of the world's leading powers has quietly eyed the small state as a potential ground to project its power in the Middle East and into the Mediterranean. But it won't be easy. With Syrian rebels and jihadis at bay, and Syrian President Bashar al-Assad's government set to further extend its comeback, Russia has pursued a cautious overture across the border into Lebanon—a $1 billion dollar arms deal, including...