In defying Joe Biden, Benjamin Netanyahu is exposing the limits of US power

The pictures out of Gaza get more harrowing with each passing day. After months of witnessing civilians grieving for loved ones killed by bombs, now we see children desperate to eat – victims of what the aid agencies and experts are united in calling an imminent “man-made” famine. What matters most about these images is their depiction of a continuing horror inflicted on the people of Gaza. But they also reveal something that could have lasting implications for Israelis and Palestinians, for Americans and for the entire world. What they show, indeed what they advertise, is the weakness of the president of the United States.

Joe Biden and his most senior lieutenants have been urging Israel to increase the flow of food aid into Gaza for months, in ever more insistent terms. This week the US secretary of state, Antony Blinken, cited the finding of a UN-backed agency that the threat of hunger now confronted “100% of the population of Gaza”,adding that this was the first time that body had issued such a warning. Earlier this month, the vice-president, Kamala Harris, told Israel it needed to do whatever it took to get humanitarian aid into Gaza: “No excuses.” The Biden administration is all but banging the table and demanding Israel act.

A week ago, it seemed to have had an effect. The Israel Defense Forces announced what was billed as a “dramatic pivot”, promising that it would “flood” Gaza with food supplies. But there’s precious little sign of it. An additional crossing has been opened, the so-called 96th gate, allowing a few more trucks to go in, but nothing on the scale that is required to avert disaster – or mitigate the disaster already unfolding. For all the talk of a pivot, there is still “a series of impediments,