Since 2012, Hezbollah has engaged on a military deployment to Syria to fight for the Assad regime in the ongoing civil war. In terms of both casualties and total manpower, this is Hezbollah's largest ever military operation. Hezbollah's involvement in Syria may weaken the group somewhat in the short term, but strengthen the group in the long term. Hezbollah relies on Assad for weaponry and as a conduit for arms, and would be threatened by the presence of Sunni militant groups on the Lebanese border.