All Policy Analysis by Matthew Levitt

As the nuclear agreement moves toward implementation, contending with the 'menacing behavior' of Iran's proxy groups and military elite should be at the top of the administration's agenda.

The following is Dr. Levitt's contribution to a Council on Foreign Relations roundtable discussing the implications of the nuclear agreement . Iran is Hezbollah's primary benefactor, giving the Lebanese political party and militant group some $200 million a year in addition to weapons, training, intelligence, and logistical assistance. Over the

A closer look at how an Iranian-linked Hezbollah chief bombed the Khobar Towers and walked free -- until last month.

The Washington Institute is studying the potential impacts of the Iran nuclear deal, including the effects of additional Iranian money from a post-sanctions windfall. Here are some of the most important impacts.

Iran has worked hard to chip away at the international consensus on sanctions, and if the current nuclear terms are not clarified and bolstered, it will meet that goal.

A post-sanctions windfall would give Tehran ample capacity to rescue the Syrian regime, reshape Iraq's political environment, expand its terrorist proxy activities in various theaters, and otherwise amplify the effects of its destabilizing regional posture.

Given the depth of its involvement in Syria, Iraq, and Yemen, Hezbollah will likely continue to head an emerging Shiite foreign legion bent on expanding Iranian influence across the region.

The Lebanese terrorist group continues to operate in Europe despite warnings from the EU.

Even with a deal now signed, the Obama administration still has many tools for countering Iran’s menacing behavior across the Middle East.

The group's establishment of a territorial "caliphate," the emergence of an unprecedented foreign fighter phenomenon, and the rise of violent extremist social media and lone offender attacks have fundamentally transformed the global terrorist threat.

Contrary to recent intelligence assessments by other agencies, the State Department's latest report documents Hezbollah and Iran's ongoing, deep involvement in terrorist activities.

Recent attacks on the Syrian Druze community threaten to further roil sectarian tensions, radicalize Druze elements, and potentially draw Israel into the civil war.

Rather than acting on the mountain of existing evidence uncovered by a tragically slain prosecutor, Argentina is allowing an Iranian fugitive to undermine its investigation into a mass terrorist attack in downtown Buenos Aires.

The assignment of skilled senior operatives to support Houthi rebels in Yemen underscores the importance that Hezbollah attributes to its activities in the Arabian Peninsula.

Given Tehran and Hezbollah's long history of targeting Saudi interests, their recent implicit threats to the kingdom should be taken seriously.

As events in Syria and Iraq convulse the region, the resultant humanitarian disaster and security nightmare have contributed to a reshaping of the terror finance environment.