All Policy Analysis by Matthew Levitt

America's latest terrorist incident shows why the preferred metaphor to describe such attacks is usually a contradiction in terms.

As authorities scramble to prepare for the ways in which the Islamic State threat will continue to evolve, many lessons can be learned by looking at the factors that led to its rise. This seventh volume of Counterterrorism Lectures traces ISIL's evolution during 2015.

While Hezbollah's next war with Israel seems inevitable in the long term, recent events and rhetoric suggest that the group and its Iranian patron will focus on targeting Saudi interests in the meantime.

Although Hezbollah and its affiliates are highly unlikely to attack the Rio Olympics, the group's troubling activities in Brazil and neighboring countries should not be ignored.

The anniversary of two deadly attacks is a sobering reminder that the group continues to engage in terrorist plots and criminal fundraising around the world while unabashedly denying the mountains of evidence against it.

One year after the signing of the nuclear deal with Iran, how has the agreement changed the Iranian economy, Tehran's foreign policy, and Russia's role in the Middle East? Watch video briefings by Washington Institute experts.

The Cipher Brief sat down with Matt Levitt, former deputy assistant secretary for intelligence and analysis at the Treasury Department, to discuss Hezbollah's roles in Lebanon and Syria and as a proxy for Iran. According to Levitt, despite losses in Syria, Hezbollah remains a threat to Israeli security and U.S

Thus far, the Obama administration has not fulfilled its pledge to deter and confront external threats to Gulf partners following the nuclear deal.

The Islamic Republic's terror sponsorship has hardly abated since the nuclear deal was reached, giving the Obama administration another opportunity to reassess these menacing behaviors and hold Tehran accountable.

Assess how the Joint Comprehensive Plan of Action (JCPOA), the nuclear agreement with Iran, has affected various U.S. interests one year after its announcement on July 14, 2015.

Last month's assassination of a senior Hizbullah commander, apparently by Syrian rebel groups, demonstrates the growing threat the organization faces from fellow Arabs and Muslims.

Iran has long used Hezbollah and other radical Shi'a groups to project power across the Gulf. The CIA noted this trend in an 1986 assessment in which it concluded that "Iran uses international terrorism to achieve specific foreign policy objectives. Therefore it should not be surprising that despite the recent

Mustafa Badreddine's death will hurt the group's operational efforts and morale in Syria, but it remains to be seen who it will blame for the attack and whether it will retaliate.