For three decades, Hezbollah maintained a singular focus as a Lebanese military group fighting Israel, The New York Times reported Sunday. 
"It built a network of bunkers and tunnels near Lebanon’s southern border, trained thousands of committed fighters to battle Israel’s army and built up an arsenal of rockets capable of striking far across the Jewish state," it added.
"But as the Middle East has changed, with conflicts often having nothing to do with Israel flaring up around the region, Hezbollah has changed, too," the paper claimed.
Speaking about the Lebanese group, the paper said: "It has rapidly expanded its realm of operations. It has sent legions of fighters to Syria. It has sent trainers to Iraq. It has backed rebels in Yemen. And it has helped organize a battalion of militants from Afghanistan that can fight almost anywhere."
As a result, Hezbollah is not just a power unto itself, but is one of the most important instruments in the drive for regional supremacy by its sponsor: Iran.
Hezbollah is involved in nearly every fight that matters to Iran and, more significantly, has helped recruit, train and arm an array of new militant groups that are also advancing Iran’s agenda.
Founded with Iranian guidance in the 1980s as a resistance force against the Israeli occupation of southern Lebanon, Hezbollah became the prototype for the kind of militias Iran is now backing around the region. Hezbollah has evolved into a virtual arm of Iran’s Islamic Revolutionary Guards Corps, providing the connective tissue for the growing network of powerful militias.
Months of interviews with officials, fighters, commanders and analysts from nine countries, and with members of Hezbollah itself, bring to light an organization with new power and reach that has not been widely recognized. Increasingly, Iranian leaders rely on it to pursue their goals.
Iran and Hezbollah complement each other. Both are Shiite powers in a part of the world that is predominantly Sunni. For Iran, a Persian nation in a mostly Arab region, Hezbollah lends not just military prowess but also Arabic-speaking leaders and operatives who can work more easily in the Arab world. And for Hezbollah, the alliance means money for running an extensive social services network in Lebanon, with schools, hospitals and scout troops — as well as for weapons, technology and salaries for its tens of thousands of fighters.
The network Hezbollah helped build has changed conflicts across the region.

Source: Mena