Last month an Irish member of the UN Interim Force in Lebanon (UNIFIL) was killed by Hizballah guerrillas who opened fire on his vehicle. To David Schenker, it is likely the peacekeeper was “assassinated” to send “a clear message of Hizballah’s growing hostility toward UNIFIL.” The peacekeeping force has had a presence in south Lebanon since 1978, serving first to maintain calm between Israel and the PLO, and later between Israel and Hizballah. But, Schenker explains, it seems to be accomplishing little in that regard:

In its biannual reports to the Security Council, UNIFIL openly concedes its failure to interdict weapons destined for Hizballah. While the contingent acknowledges allegations of “arms transfers to non-state actors” in Lebanon, i.e., Hizballah, UNIFIL says it’s “not in a position to substantiate” them. Given how ubiquitous UN peacekeepers are in the Hizballah heartland, this perennial failure to observe—let alone appropriate—even a single weapons delivery is a fair measure of the utter failure of UNIFIL’s mission. Regardless, Washington continues to pour hundreds of millions of dollars into this failed enterprise, and its local partner, the Lebanese Armed Forces.

Since 2006, UNIFIL patrols have periodically been subjected to Hizballah roadside bombs in what quickly proved to be a successful effort to discourage the organization proactively from executing its charge. In recent years, though, UN peacekeepers have increasingly been targeted by the terror organization that runs Lebanon, and which tightly controls the region that UNIFIL was set up to secure. The latest UN reports tell a harrowing story of a spike in the pattern of harassment and assaults on the force. . . .

Four decades on, UNIFIL’s mission has clearly become untenable. Not only is the organization ineffective, its deployment serves as a key driver of the economy in south Lebanon, employing and sustaining Hizballah’s supporters and constituents. At $500 million a year—$125 million of which is paid by Washington—the deployment is also expensive. Already, the force is in harm’s way, and during the inevitable next war between Israel and Hizballah, this 10,000-strong contingent will provide the militia with an impressive human shield.

Two weeks ago, a terrorist—most likely working for Hizballah—managed to cross into Israel from Lebanon and plant an explosive device near Megiddo that wounded a civilian. The attack, according to Matthew Levitt, is a sign of the Iran-backed militia’s increasing willingness to challenge the tacit understanding it has had with the IDF for over a decade. Such renewed aggression can also be found in the rhetoric of the group’s leaders:

In the lead-up to the 2006 war, [Hizballah’s] Secretary-General Hassan Nasrallah famously miscalculated how Israel would respond to the cross-border abduction of its soldiers. According to Israeli analysts, however, he now believes he can predict the enemy’s behavior more accurately, leading him to sharpen his rhetoric and approve a series of increasingly aggressive actions over the past three years.

Nasrallah’s willingness to risk conflict with Israel was partly driven by domestic economic and political pressures. . . . Yet he also seemed to believe that Israel was unlikely to respond in a serious way to his threats given Hizballah’s enlarged precision-missile arsenal and air-defense systems.

In addition to the bombing, this month has seen increased reports of cross-border harassment against Israelis, such as aiming laser beams at drivers and homes, setting off loud explosions on the Lebanese frontier, and pouring sewage toward Israeli towns. Hizballah has also disrupted Israeli efforts to reinforce the security barrier in several spots along the Blue Line, [which serves as the de-facto border between Lebanon and the Jewish state].

This creeping aggressiveness—coupled with Nasrallah’s sense of having deterred Israel and weakened its military posture—indicate that Hizballah will continue trying to move the goalposts.