Lebanese Shi’ite group Hezbollah on Friday vowed to strengthen its presence in wartorn Syria and send more leaders to the conflict, a week after its top military commander there was killed.

The death of Mustafa Badreddine, who Hezbollah said was killed near Damascus by shellfire from Sunni Islamist rebels, was one of the biggest blows yet to the Iranian-backed group’s leadership.

Hezbollah, Lebanon’s most powerful political and military group, has provided crucial support to the Syrian army, along with Iranian forces and the Russian air force. The group is estimated to have lost around 1,200 fighters in Syria’s five-year-old conflict. […]