On Jan. 3, 2020, the Trump administration conducted a drone strike near Baghdad International Airport, killing Iranian Major General Qassem Soleimani.

Soleimani had a long record of waging surrogate wars against Americans, especially during the Iraq conflict and its aftermath.

After the Trump cancellation of the Iran Deal, followed by U.S. sanctions, Soleimani reportedly stepped up violence against regional American bases—most of which President Donald Trump himself ironically wished to remove.

A few days later, Iran staged a performance-art retaliatory strike against Americans in Iraq and Syria, assuming Trump had no desire for a wider Middle East war.

So, Iran launched 12 missiles that hit two U.S. airbases in Iraq. Supposedly, Tehran had warned the Trump administration of the impending attacks that killed no Americans. Later reports, however, suggested that some Americans suffered concussions, while more damage was done to the bases than was initially disclosed.

Nonetheless, this Iranian interlude seemed to reflect Trump’s agenda of avoiding “endless wars” in the Middle East while restoring deterrence that prevented, not prompted, full-scale conflicts.

Yet in a second Trump administration, rethreading the deterrence needle without getting into major wars may become far more challenging. The world of today is........

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