President Joe Biden assures that he already knows how the U.S. will respond in the Middle East to the drone attack, allegedly launched by pro-Iranian militias.

Washington must very carefully calibrate its response at a time when the spotlight is multiplying for its 30,000 troops in the region. Biden faces a problem that has been repeated in other US administrations that experienced conflicts in the area: how to respond forcefully to avoid new attacks, but not to the point of triggering an escalation that could transform the panorama.